Question

A fort had enough food for 80 soldiers for 60 days. how long would the food last if 20 more soldiers join after 15 days?

it is a proportion questing, please help me and show how you solve :)

Answer 1

After 15 days, the 20 other soldiers will come in, so:

DAYS LEFT:
60 - 15 = 45
NEW EQUATION:
(80 * 45) / 100 = 36

Total days: (36 + 15)

The answer is 51 days.