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Math Help - ratio word problem

  1. #1
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    ratio word problem

    The ratio of girs to boys in Sat class is 4 : 5. lf there are 5 more boys than girls,which of the following is the number of students in this class?

    (A) 9 (B) 18 (c) 45 (D) 90 (E) 180
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  2. #2
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     4:5 \Rightarrow x:x+5

    Therefore

     \frac{x}{4}=\frac{x+5}{5}

     5x = 4(x+5)

     5x = 4x+20

    can you solve it form here?
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