Ratio of boys to girls
Algebra
Level
1
In a classroom, the ratio of the number of boys to girls is . Find the number of boys if there are students in the classroom.
The answer is 40.
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1 solution
The ratio is 4:3. Assume the class has 7 people: there would then be 4 boys and 3 girls.
So: 70 = 7 * 10. Scale up by 10, and 4 boys * 10 = 40.