Question

2. The boys and girls in a school are in the ratio 8: 3. If the number of girls is 405, how many boys
are there in the school?​

Answer 1

Answer:

1080

Step-by-step explanation:

let boys = a

boys/girls=8/3

=a/405

CROSS MULTIPLY

a=405×8/3

=1080

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Answer 2

$\bf \underline{ \ QUESTION}$

The boys and girls in a school are in the ratio 8: 3. If the number of girls is 405, how many boys

are there in the school?

$\bf \underline{ \ GIVEN}$

Number of girls =405

Ratio=8:3

$\bf \underline{ FIND}$

Number of boys =?

$\bf \underline{ANSWER}$

⇒The given ratio of boys and girls in a school are 8:3.Let 8x and 3x be the number of boys and girls in the school.

$\bf ⇒ Number \: of \: girls \: in \: school = \: 405 \\ </p><p> \bf ⇒ 3x=405 \\ </p><p></p><p> \bf⇒ x= \frac{405}{3} \\ </p><p> \bf⇒ x=135$

Now by using boys ratio

$\bf⇒ Number \: of \: boys \: in \: school =8x \\ </p><p> \bf =8×135 \\ </p><p> \bf=1080 \\ </p><p> </p><p>$

Hope it's help you