amy2280 amy2280

19-03-2020
Mathematics

contestada

The ratio of boys to girls in a group is 7:1. If there are 42 more boys than girls, work out how many girls there are.

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jimrgrant1 jimrgrant1

19-03-2020

Answer:

7 girls

Step-by-step explanation:

The ratio of boys : girls = 7 : 1 = 7x : x ( x is a multiplier )

There are 42 more boys than girls, thus

7x = x + 42 ( subtract x from both sides )

6x = 42 ( divide both sides by 6 )

x = 7

Hence

there are 7 girls

and 7x = 7 × 7 = 49 boys

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