Example:
10 men can lay a road 75 Km. long in 5 days. In how many days can 15 men lay a road 45 Km. long.
Solution:
Let x be number of days.
Ratio of days = 5:x.
Number of men is inversely proportional to number of days.
So inverse of ratio of men = 15:10 = 3:2.
Length of road is directly proportional to number of days.
Therefore, Ratio of lengths = 75:45 = 5:3
5:x = 3*5:2*3
x*3*5 = 5*2*3
x = (5*2*3)/(3*5)
x = 2.
Number of days required = 2 days.
Directions: Solve the following problems. Also write at least ten examples of your own.
