Question

a given quantity of rice is sufficient for 60persons for 3 days how many days should the rice last for 18 person

Answer 1

let the quantity of rice be x
let the amount consumed by a person in 1 day be a
atq
x=60a*3
x=180a
x/a=180-----(1)

let the rice last for 18 persons for b days
=>x=18ab
=>b=x/18a
from (1)
x/a=180
=>b=180/18
=>b=10
thus the rice will last for 10 days for 18 persons

Answer 2

Let the days be x
18\60*3=x
9\10=x
9days

I hope answer is correct