Question

A stock of grains in hostel is sufficient for 60 days for 500 students. If 300 new students are admitted after 12 days then how many days the stock will be sufficient for them?

Answer 1

student increases,days decreases
inverse variation
x1y1=x2y2

500×48=800×x
=x=500×48/800
=x=30
thus 30days