Find the mean of 25 numbers, if the mean
of 15 of them is 18 and the mean of the remaining numbers is 13.
the answer given is wrong. the solution itself states the answer as d option, i.e. 16
A leak at the bottom of a tank can empty the full tank in 6 hours. An inlet pipe fills water at the rate of 4 litres per minute. When the tank is full, the inlet is opened and due to the leak, the tank gets empty in 8 hours. The capacity of the tank is