A contractor estimates that 3 persons could rewire Jasminder’s house in 4 days. If, he uses 4 persons instead of three, how long should they take to complete the job?

Let time taken to complete the job be x.
Persons 3 4
Days 4 x
Here the number of persons and the number of days are in inverse proportion.
∴ 3/4 = x/4 ⇒ 4Xx=3×4 ⇒ x=3×4/4= 3days
Hence, they will complete the job in 3 days.

Class 8 Maths Chapter 11 Exercise 13.2 Solution in Video

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