parisjackson parisjackson

09-03-2016
Mathematics

contestada

The ratio of girls to boys who participated in the quiz bowl was 7:5. There were 42 girls in the competition. How many boys participated? A) 28 B) 30 C) 35 D) 49

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dwarfpluto dwarfpluto

09-03-2016

The way i do it, is sort of like this :

Is 7 a factor of 42?
Is 5 a factor of 42?

7 is a factor of 42.
It must be in multiples of 7!

Therefore, we have 5 on the other side, which makes it 5 x 7 = 35

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