2 Answers

GarMan · Answer 1 · 2018-05-23T15:57:35+0000

There are 30 boys in the competition. You can find it by first dividing 42 by 7 which is 6, then you multiply 6 by 5 to get 30.

Mpospelov · Answer 2 · 2018-05-29T02:03:22+0000

Alright! To answer this, you need to cross multiply. Before doing that, set up your ratios

7:5
42: x

7x= (5x42)
7x= 210
x= 210 / 7
x= 30 boys

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