50 men took a dip in a water tank 40 m long and 20 m broad on a religious day . if the average displacement of water by a man is 5 m 3 , then the rise in the water level in the tank will be :
"explanation : total volume of water displaced = ( 5 x 50 ) m 3 = 250 m 3 rise in water level = 250 / 40 ã — 20 = 0.3125 m = 31.25 cm answer : a"
divide(multiply(5, 50), multiply(40, 20))