Question 608031
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Hi
In a class of 24 students
Let x and (24-x) represent the number of boys and girls respectively
Question states***ratio of boys to girls is 3:5
 {{{x/(24-x) = 3/5}}}    |Cross Multiplying to solve
    5x = 3(24-x)
    5x = 3·24 -3x
    8x = 3·24
     x = 3·24/8 = 9 boys  and 15 girls
CHECKING our Answer***
  9/15 = 3/5. a 3:5 ratio