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Question -

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 -

If the number of persons is increased, it will take less number of days to complete the job.
Thus, the two quantities are in inverse proportion.

Number of persons

Number of days

3

4

4

k

Let the requirednumber of days be k.
x1y1 = x2y2
3 × 4 = 4 × k
k = 3 days.
Hence, the required number of days = 3.

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