Question

15 girls can complete a work in 2 days .1 girl can complete it in?
A. 20 days
B. 15 days
C. 7.5 days
D. 30 days​

Answer 1

D. 30 days (time and people is inversely proportional)

Answer 2

Concept:

Work done by girls represents their efficiency of doing work.

Given:

We have,

15 girls can complete a work in 2 days.

Find:

We are asked to find in how many days 1 girl can complete the whole work.

Solution:

We have,

15 girls can complete a work in 2 days

So,

To find the work done by one girl in one day,

First, we have to find out the total work,

So,

15 girls = 2 days,

Let,

One girl do one work in one day,

So,

15 girls complete 15 work in one day,

i.e.

15 girls complete work in 2 days = 15 × 2 = 30

i.e.

Total work = 30,

So,

1 girl complete 30 work = (30/1) = 30 days

Hence, 1 girl completes the whole work in 30 days i.e. option D .

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