Question

An football camp of 30 boys has provision for 20 days. After 10 days, 10 boys left the camp. The food will last for

___ days.

Answer 1

Remaining number of boys = 30-10 =20 boys

Remaining number of days = (20-10) days = 10 days.

30 boys had provisions for 20 days

1 man had provisions for $(30\times 20)$ days
Provisions left after 10 days ( If there was only 1 man ) = 600 - ( 30*10)= 300

20 boys will have provisions for $\frac{\left(300\right)}{20}$ days

= 15days

hence, the remaining food will last for 15 days.