Question

Please solve the equation
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Answer 1

Answer:

Total pupils = 40

No. of girls = 3/5 of 40

→ 3×40/5 = 3×8 = 24

Thus , number of boys = 40-24 = 16 Ans.....

or by equation :

Total pupils = 40

Let the no. of boys be x.

No. of girls 3/5 of 40 .

→ x + 3×40/5 = 40

→ x + 24 = 40

→ x = 40 - 24

→ x = 16 Ans...

Step-by-step explanation:

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Answer 2

Question :

In a class of 40 pupils, the number of girls is three-fifth of the number of boys. Find the number of boys in the class.

Given :

• Total number of pupils in the class = 40.
• The number of girls is three-fifth of the number of boys.

To Find :

• Total number of boys in the class.

Solution :

Let the number of boys in the class be x

According to the question -

• The number of girls is three-fifth of the number of boys.

$\longrightarrow$ The number of girls = $\sf{\dfrac{3}{5}x}$

Total pupils = Number of boys + Number of girls

$\longrightarrow \sf{40 = x + \dfrac{3}{5}x}$

$\longrightarrow \sf{40 = x\bigg(1 + \dfrac{3}{5}\bigg)}$

$\longrightarrow \sf{40 = x\bigg(\dfrac{5+3}{5}\bigg)}$

$\longrightarrow \sf{40 = x\bigg(\dfrac{8}{5}\bigg)}$

$\longrightarrow \sf{\cancel{40} \times \dfrac{5}{\cancel{ \: 8}} = x}$

$\longrightarrow \sf{ 5 \times 5 = x}$

$\longrightarrow \sf{ 25 = x}$

• Total number of boys in the class = 25.