Question

if 40 persons consume 240 kg of rice in 15 days then number of days in which 30 persons consume 48kg of rice

Answer 1

40 person in 15 day consumes 240kg
1person in 15 days will consume 240/40kg=6kg
1 person in 1 day will consume 6/15kg=0.4kg
30 person in 1 day will consume 0.4*30kg=12kg
time taken to consume 48 kg=48/12=4days
Hope It helps

Answer 2

240kg of rice is consumed in 40*15 person-days.

1kg of rice is consumed in (40*15)/240 = 2.5

48kg of rice is consumed in 2.5*48 = 120.

120/30 = 4 days.

The number of days = 4.