Question

A fort is provided with food for 80 soldiers to last for 60 days. Find how long would the food last if 20 additional soldiers join after 15 days?

Answer 1

After 15 days are over. 
 on 16th day = 80 soldiers and food for ( 60 - 15) = 45 days. 
Now 20 more soldiers come and total = 100 
so, 80 soldiers can consume food in 45 days 
and 1 soldier can consume = 45 * 80 
and 100 soldiers can consume in ( 45 * 80) / 100  = 36 days. 
So 15 days are already over + 36 more days = 51 days

Answer 2

Answer:

Step-by-step explanation:

After 15 days are over.  

on 16th day = 80 soldiers and food for ( 60 - 15) = 45 days.  

Now 20 more soldiers come and total = 100  

so, 80 soldiers can consume food in 45 days  

45 * 80  

( 45 * 80) / 100  = 36 days

15+36 = 51 days