Question

In a camp there is enough flour for 300 persons for 42 days. How long the flour last if 20 more persons join the camp?

Answer 1

No. of people          No. of days

300                            42

320                            x

(As more people means that the food last for less days. So , its inverse variation).

=> x/42=300/320

(cross- multiply)

=>x*320=42*300

=>x       =42*300/320

=>x       =315/8

=>x       = 39.374 days or 39(3/8)days (mixed fraction) = ans.