16) There are two water tanks A and B, A is much smaller
than B. While water fills at the rate of one litre every
hour in A, it gets filled up like 10, 20, 40, 80, 160... in
tank B. (At the end of first hour, B has 10 litres , second
hour it has 20, and so on). If tank B is 1/32 filled after
21 hours, what is the total duration required to fill it
completely?
a) 26 hrs b) 25 hrs c) 5 hrs d) 27 hrs

Answer Posted / siddarth

The given fraction part is 1/32 or (1/2^5)
as given series is 10(1,2,4,8,16...)or 10(2^0,2^1,2^2,2^3,2^4,2^5..) in the series we got 2^5 as after 5 hours.
so after 21 hours from 5 hours i.e 21+5=26 (ans=26)

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