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27 March, 03:32

When 18 boys Joined a group of y students, the Ratio of boys to girls in the group became 4:5. Write an algebraic expression for the number of girls in terms of y.

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  1. 27 March, 06:33
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    Boys + Girls = y

    (B + 18) : G = 4 : 5

    5 (B + 18) = 4 g

    5 B + 90 = 4 G

    5 B = 4 G - 90 / : 5

    B = 4/5 G - 18

    Then:

    4/5 G - 18 + G = y

    9/5 G = y + 18 / * 5/9

    G = 5 * (y + 18) / 9

    Answer:

    Number of girls in terms of y is:

    G = 5/9 y + 10
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