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NCERT Solutions Class 8 Mathematics Solutions for Exercise 13.2 in Chapter 13 - Direct and Inverse Proportions

Question 12 Exercise 13.2

Q6) 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?

Answer:

Solution:

Let the time taken to complete the job be x.

Here the number of persons and the number of days are in inverse proportion.

\therefore\frac{3}{4}=\frac{x}{4}

\Rightarrow\frac{4\times3}{4}=x

\Rightarrow\frac{12}{4}=x

\Rightarrow\ x\ =\ 3

They will complete the job in 3 days.

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