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Question

Answers

A. 25

B. 30

C. 35

D. 48

Answer

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\[\text{Number of boys }+\text{ Number of girls }=\text{ 48}\].

Now as we know the number of girls is \[\dfrac{3}{5}\] of the number of boys so substitute it and hence find the number of boys.

In the question we are told that in a class of 48 students the number of girls is three-fifth then the number of boys. So, we have to find a number of boys.

So, we can write according to the question,

\[\text{Number of girls}=\dfrac{3}{5}\times \text{ number of boys}\text{.}\]

As we know that total strength of class which is 48. So we can also tell that the number of boys + number of boys is equal to 48.

Now we know that the number of girls is equal to \[\left( \dfrac{3}{5} \right)\] times the number of boys. So we can use it as,

Number of boy’s \[+\dfrac{3}{5}\] number of boys

\[\Rightarrow \text{number of boys}\left\{ 1+\dfrac{3}{5} \right\}\]

\[\Rightarrow \text{number of boys}\times \dfrac{8}{5}\]

Now we can say that the number of boys \[\times \dfrac{8}{5}\] can be written as 48.

So,

\[\dfrac{8}{5}\times number\text{ of boys=48}\]

we can also write,

\[Number\text{ of boys=48}\times \dfrac{8}{5}\]

Now on simplification we can say that the number of boys is 30.