10 boys clear a piece of land in 21 days. How many days will it take 7 boys to clear the same land at the same rate Pls i need answer fast

Given:

10 boys clear a piece of land in 21 days.

To find:

The number of days it will take 7 boys to clear the same land at the same rate.

Solution:

We have,

10 boys clear a piece of land in 21 days.

Total work =

                 =

Let 7 boys clear the same piece of land in x days.

Total work =

                 =

Now, the total work is same.

Divide both sides by 7.

Therefore, 7 boys clear the same piece of land in 30 days.

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