Quantitative Interview Preparation Guide Download PDF
Quantitative Frequently Asked Questions in various Quantitative Interviews asked by the interviewer. So learn Quantitative with the help of this Quantitative Interview questions and answers guide and feel free to comment as your suggestions, questions and answers on any Quantitative Interview Question or answer by the comment feature available on the page.
31 Quantitative Questions and Answers:
Table of Contents:
1 :: Can you tender a one rupee note in such a manner that there shall be total 50 coins but none of them would be 2 paise coins?
45 one paisa coins, 2 five paise coins, 2 ten paise coins, and 1 twenty-five paise coins
paisa no. of coins
1 40 = 40
5 8 = 40
10 2 = 20
--------------------------------
50 100
paisa no. of coins
1 40 = 40
5 8 = 40
10 2 = 20
--------------------------------
50 100
2 :: If time at this moment is 9 P.M., what will be the time 23999999992 hours later?
1 P.M.24 billion hours later, it would be 9 P.M. and 8 hours before that itwould be 1 P.M.
4 :: If s(a) denotes square root of a, find the value of s(12+s(12+s(12+ ...... upto infinity?
4 Explanation :
Let x = s(12+s(12+s(12+..... )
We can write x = s(12+x). i.e., x^2 = 12 + x. Solving this quadratic equation, we get x = -3 or x=4. Sum cannot be -ve and hence sum = 4.
Let x = s(12+s(12+s(12+..... )
We can write x = s(12+x). i.e., x^2 = 12 + x. Solving this quadratic equation, we get x = -3 or x=4. Sum cannot be -ve and hence sum = 4.
6 :: What is the sum of all numbers between 100 and 1000 which are divisible by 14?
35392Explanation : The number closest to 100 which is greater than 100 and divisible by14 is 112, which is the first term of the series which has to be summed.The number closest to 1000 which is less than 1000 and divisible by 14 is 994,which is the last term of the series.112 + 126 + .... + 994 = 14(8+9+ ... + 71) = 35392.
7 :: A fast typist can type some matter in 2 hours and a slow typist can type the same in 3 hours. If both type combinely, in how much time will they finish?
1 hr 12 minExplanation : The fast typist's work done in 1 hr = 1/2 The slow typist's work done in 1 hr = 1/3 If they work combinely, work done in 1 hr = 1/2+1/3 = 5/6 So, the work will be completed in 6/5 hours. i.e., 1+1/5 hours = 1hr 12 min.
8 :: Each side of a rectangle is increased by 100% .By what percentage does the areaincrease?
300%.
100% of l=l
new length = l+l= 2l
new width = b+b= 2b
old area = l*b
new area = 2l * 2b
= 4lb
therfore increase in area= 400%
100% of l=l
new length = l+l= 2l
new width = b+b= 2b
old area = l*b
new area = 2l * 2b
= 4lb
therfore increase in area= 400%
9 :: A contractor agreeing to finish a work in 150 days, employed 75 men each working 8 hours daily. After 90 days, only 2/7 of the work was completed. Increasing the number of men by ________ each working now for 10 hours daily, the work can be completed in time?
150 men.Explanation:One day?s work = 2 / (7 * 90)One hour?s work = 2 / (7 * 90 * 8)One man?s work = 2 / (7 * 90 * 8 * 75)The remaining work (5/7) has to be completed within 60 days, because thetotal number of days allotted for the project is 150 days.So we get the equation(2 * 10 * x * 60) / (7 * 90 * 8 * 75) = 5/7 where x is the number of menworking after the 90th day.We get x = 225Since we have 75 men already, it is enough to add only 150 men..
90*75*8 = 2/7(work)
now 5/7 th of work left..
so 60*(75+x)*10 =5/7(work)
x=no of workers..
devide the two equations..
x=150
90*75*8 = 2/7(work)
now 5/7 th of work left..
so 60*(75+x)*10 =5/7(work)
x=no of workers..
devide the two equations..
x=150
10 :: 7^101+18^101 is a multiple of
a.15
b.25
c.35
d.45?
"Clearly," Naveen Reddy is an idiot. 7^101 + 18^101 is not the same as 7*101 + 18*101
11 :: Five boys were climbing a hill. J was following H. R was just ahead of G. K was between G & H. They were climbing up in a column. Who was the second?
G.Explanation:The order in which they are climbing is R - G - K - H - J.
Another order is also possible: (top)H-J-K-R-G (bottom). And another possibility is: (top)H-K-J-R-G(bottom). "K was between G&H" doesn't mean "only K was between G&H". Finally, there is no way to tell for sure if G,J or K was the second.
Another order is also possible: (top)H-J-K-R-G (bottom). And another possibility is: (top)H-K-J-R-G(bottom). "K was between G&H" doesn't mean "only K was between G&H". Finally, there is no way to tell for sure if G,J or K was the second.
12 :: If on an item a company gives 25% discount, they earn 25% profit. If they now give 10% discount then what is the profit percentage?
30%.
The Profit shall be 50%.
Consider the item price as Rs.10.
After 25% discount, the cost would be Rs 7.5
Company would be profiting 25% on original price. Hence original price is Rs 6. (25% of 6 is 1.5. So 1.5+6=7.5)
Now if discount is 10% , the cost of item would be Rs.9. Hence 50% profit (as Rs 9 is 1.5 times of 6)
The Profit shall be 50%.
Consider the item price as Rs.10.
After 25% discount, the cost would be Rs 7.5
Company would be profiting 25% on original price. Hence original price is Rs 6. (25% of 6 is 1.5. So 1.5+6=7.5)
Now if discount is 10% , the cost of item would be Rs.9. Hence 50% profit (as Rs 9 is 1.5 times of 6)
13 :: How big will an angle of one and a half degree look through a glass that magnifies things three times?
1 1/2 degrees Explanation :
The magnifying glass cannot increase the magnitude of an angle..
The magnifying glass cannot increase the magnitude of an angle..
14 :: If there are 1024*1280 pixels on a screen and each pixel can have around 16 million colors. Find the memory required for this?
4MB.
each pixel can store a color ..that is either of the Red ,Green or Blue [RGB] colors.so all these 3 colors are stored consecutively in 1024 * 1280 pixels to display 16million colors approx..then the total memory used would be 1024 *1280 *3 = 3932160 bytes = 4mb
each pixel can store a color ..that is either of the Red ,Green or Blue [RGB] colors.so all these 3 colors are stored consecutively in 1024 * 1280 pixels to display 16million colors approx..then the total memory used would be 1024 *1280 *3 = 3932160 bytes = 4mb
15 :: A dishonest shopkeeper professes to sell pulses at the cost price, but he uses a false weight of 950gm. for a kg. His gain is____%.
5.3 %Explanation:He sells 950 grams of pulses and gains 50 grams.If he sells 100 grams of pulses then he will gain (50 / 950) *100 = 5.26.
5% [Explanation: He sells 950 grams of pulses and gains 50 grams. He is getting 50 grams of pulse on 1000 grams. I.e. 5 % (50 / 1000 = 5/100)]
5% [Explanation: He sells 950 grams of pulses and gains 50 grams. He is getting 50 grams of pulse on 1000 grams. I.e. 5 % (50 / 1000 = 5/100)]
16 :: If x=y=2z and xyz=256 then what is the value of x?
x=y=2z;
xyz=256
or,xy.2z=2.256=512
or,x.x.x=512
or,x^3=8^3
or,x=8(Ans).
xyz=256
or,xy.2z=2.256=512
or,x.x.x=512
or,x^3=8^3
or,x=8(Ans).
17 :: What is the angle between the two hands of a clock when time is 8:30?
75(approx).
ans is 75 degree
explaination;
hour hand 12hr-360deg
8hr-?
(8*360)/12=240deg
again hour hand 60min-30deg
30min-?
(30*30)/60=15deg
so total hr hand=240+15=255deg
now min hand; 60min-360deg
30min-?
(30*360)/60=180deg
difference will b 255-180=75deg
ans is 75 degree
explaination;
hour hand 12hr-360deg
8hr-?
(8*360)/12=240deg
again hour hand 60min-30deg
30min-?
(30*30)/60=15deg
so total hr hand=240+15=255deg
now min hand; 60min-360deg
30min-?
(30*360)/60=180deg
difference will b 255-180=75deg
18 :: In objective test a correct ans score 4 marks and on a wrong ans 2 marks are subtracted, a student score 480 marks from 150 question. how many ans were correct?
130.
Let,x be the correct answer and y
be the incorrect answer.
So,x+y=150..........(1)
and 4x-2y=480........(2)
By solving (1)& (2),
x=130.
So, the 130 questions were correct answer(Ans).
Let,x be the correct answer and y
be the incorrect answer.
So,x+y=150..........(1)
and 4x-2y=480........(2)
By solving (1)& (2),
x=130.
So, the 130 questions were correct answer(Ans).
19 :: A student divided a number by 2/3 when he required to multiply by 3/2. Calculate the percentage of error in his result?
0 %Explanation:Since 3x / 2 = x / (2 / 3).
Student actually wants
x*(3/2) = 3x/2
but he did
x/(2/3) = 3x/2
So, 0% of error in the result.
Student actually wants
x*(3/2) = 3x/2
but he did
x/(2/3) = 3x/2
So, 0% of error in the result.
21 :: If the 3 digit number AB9 is a perfect square then is A an odd digit?
AB9is a perfect square.Hence unit digit of the number must be 3 or 7.Since the perfect square is a 3 digit number the numbers can be either 13,17,23,27.....the perfect squares of these numbers are 169,289,529,729..therefore its not essential that the digit 'A' must be an odd number.