NCHMCT JEE 2021 Question Paper with solutions for online practice

Question : 69 of 200

Marks: +1, -0

The ratio of the number of boys and girls in a college is

7: 8

. If the percentage increase in the number of boys and girls be

20 \%

and

10 \%

respectively, what will be the new ratio?

Solution:

Originally, let the number of boys and girls in the college be

7 x

and

8 x

, respectively. Their increased number is

(120 \%

7 x)

and

(110 \%

8 x)

.
i.e.

(\;{120}/{100} × 7 x)

and

(\;{110}/{100} × 8 x)

i.e.

\;{42 x}/{5}

and

\;{44 x}/{5}

∴

Required ratio

=\;{42 x}/{5}: \;{44 x}/{5}=21: 22

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