Question

In a class there are 45 students, out of them 15 are girls find the ratio of Boys to Girls.
a) 2:1
b)1:2
c) 1:3
d)3:1

Answer 1

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1

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There are 45 students in a class. 2/5 of them are boys. How many are girls?

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100+ Answers

Michael Nichols, Environmental Science (2000-present)

Answered November 11, 2018

If 2/5 are boys then 3/5 are girls

These added together equal 5/5 which is the total number in the class ( 45 in this example )

45 divided by 5 equals 9

3 fifths would be 3 x 9 = 27 girls

The other way is to let x = number of girls

multiply 45 ( total # students) by (3/5)

x = 45 (3/5)

x = 135/5 = 27 girls