grewb3eraad9oiz grewb3eraad9oiz
  • 19-12-2016
  • Mathematics
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A class of 28 students. the ratio of girls of 3 girls 4 boys. what is the ratio for the number of boys to total number students in the class?

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greenacres greenacres
  • 19-12-2016
You need to make a proportion.  Cross multiply then divide

boys          4      x
students    7      28

(4)(28) = 7x
112 = 7x
x= 16

There are 16 boys
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