200 Men Have Provisions For 30 Days

200 men have provisions for 30 days. If 50 men left, the same provisions would last for the remaining men, in how many days?

Answers:

200 men have provisions for = 30 days
1 man will have provisions for = 30 x 200 days
200 – 50 = 150 men will have provisions
for = \frac { 30 x 200 }{ 150 } days = 40 days