Question

If 7 boys can complete a job in 21 days, how long will 42 boys take to complete the job?

Answer 1

Answer:

3.5 days

Step-by-step explanation:

7 boys-21 days

42 boys-? days

inverse variation

=7*21/42

=3.5 days

Answer 2

Answer:

It will take 3.5 days for 42 boys to complete the same job

Step-by-step explanation:

Given, 7 boys can complete a job in 21 days

To find: number of days required by 42 boys to complete the same job

Let 'x' be the number of days required by 42 boys to complete the same job

boys    7        42

days   21        x

7×21 = 42x

147 = 42x

x = $\frac{147}{42}$

x = 3.5

Thus, it will take 3.5 days for 42 boys to complete the same job

#SPJ3