In a class of 42 students, the number of boys is 2/5 of the girls. How many boys and girls are there?

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21-10-2017
Mathematics

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In a class of 42 students, the number of boys is 2/5 of the girls. How many boys and girls are there?

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texaschic101 texaschic101 · Answer 1 · 2017-10-21T16:05:22+02:00

texaschic101 texaschic101

21-10-2017

b + g = 42
b = 2/5g

2/5g + g = 42
2/5g + 5/5g = 42
7/5g = 42
g = 42 / (7/5)
g = 42 * 5/7
g = 210/7
g = 30 <== there are 30 girls

b = 2/5g
b = 2/5(30)
b = 60/5
b = 12 <=== there are 12 boys

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