A fort has provision for 150 men for 45 days. After 10 days 25 men left the fort . How long will the food last at the same rate?
The remaining food would last (45−10)=35days
Number of remaining men =150−25=125
150 men=35 days
125 men =x days
⇒150×35125=x
∴x=42
Hence the food will long last at the rate of 42 days.