Question

7 men can do a piece of work in 9 days, how long would 21 men take to do it?​

Answer 1

Answer:

3 days

Step-by-step explanation:

7 men do the work in 9 days

1 men do the work in 9 x 7 days

21 men do the work in 9 x 7 / 21 days

                                  = 3 days

Answer 2

Given:-

• 7 men can do a piece of work in 9 days.

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To find:-

• time taken by 21 men to do the same work.

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Solution:-

Firstly,

• finding the time taken by 1 men to do the same work.

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→ 7 × 9

→ 63 days

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Now,

• finding the time taken by 21 men to do the same work.

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→ time taken by 1 men/21

→ 63/21

→ 3 days

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Hence,

• the time taken by 21 men to do the same work is 3 days.