Question

A fort has enough food for 400 soldiers for 12 days. If 80 soldiers join them the food will last for

Answer 1

total food is=400×12
from a formula m1d1=m2d2
400=man
12=day
after adding some soldier m2=400+80=480
d2=?
400×12=480×x
400×12/480=x
after solving equation
value of x is 10
it means food last for 10 day

Answer 2

soldiers at fort=400
for 400 soldiers food last for=12days
for 1 soldier food lasts for=12×400
for 480 soldiers food last for=(12×400)/480
=10days