Question

In a class of 30 students 40% are girls. Find the number of boys.Answer with steps ​

Answer 1

Number of g.i.r.l.s are 40% of the total students.

So, Number of g.i.r.l.s = 40/100*30

So, 2/5*30 = 12 g.i.r.l.s

Number of boys = 30 - 12 = 18

Or

100 - 40 = 60%

So number of boys = 60/100*30

3/5*30 = 18 boys

So, there are 12 g.i.r.l.s and 18 boys.

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Answer 2

Answer:

Given:-

• $\sf{ Total \: \: number \: \: of \: \: students= 30}$
• ${ \sf { Percentage \: \: of \: \: girls = 40 \%}}$

To Find:-

• $\sf{Number \: \: of \: \: boys}$

${ \sf{ \underline{ \underline{Step \: 1}}}}$

→ Number of Girls= 40% of 30

→ = 40/100×30

→ = 4×3

→ = 12 girl students

$\sf{ \underline{ \underline{Step \: 2}}}$

So, Number of boys= Total number of students — Number of Girls

= 30 — 12

= 18 boy students