Aptitude Question:

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With just six weights and a balance scale, you can weigh any unit number of kgs from 1 to 364. What could be the six weights?

Aptitude Interview Question
Aptitude Interview Question

Answer:

The six weights will be 1 kg, 3kg,9kg, 27kg, 81 kg, and 243kg.
for instance to weigh 2kg= 3kg-1kg...and so on for all the weights

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In the reading room of a library, they are 23 reading spots. Each reading spot consists of a round table with 9 chairs placed around it. There some readers such that in each occupied reading spot there are different number of readers. If in all there are 36 readers, how many reading spots do not have even a single reader?(loga)^2-(logb)^2 =?