Q)There are two pipes A and B. If A filled 10 liters in an
hour, B can fill 20 liters in same time. Likewise B can fill
10, 20, 40, 80, 160…... If B filled in 1/16 of a tank in 3
hours, how much time will it take to fill the tank completely?
1) You have 8 coins. 3 of them weigh x units, 3 y
units, 1 a units and 1 b units. They are all mixed and look
identical. You have to find the lightest coin in minimum
number of weighing .