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If 10 people can dig a trench in 6 days, how many people can dig it in 4 days?

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answer is C.

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Detailed Solution

Given,
10 people dig a trench in 6 days.
Let the number of people who can dig trench in 4 days be x.
Then,

No. of people	10	x
No. of days	6	4

As this is case of inverse proportion, therefore the product will remain constant throughout table that is,

10 × 6 = 4 x

Dividing both sides by 4,

x = 604

x = 15

Hence, the number of people who can dig trench in 4 days is 15.
Therefore, option 3 is correct.

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