the ratio of boys to girls in a classroom is 7:5 4 boys are added to the class the ratio is now 1:1 find the total number of girls in the cl

Question

the ratio of boys to girls in a classroom is 7:5 4 boys are added to the class the ratio is now 1:1 find the total number of girls in the class

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Kim Chi 7 months 2021-08-10T23:25:03+00:00 1 Answers 2 views 0

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  1. Bo
    0
    2021-08-10T23:26:08+00:00
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    Answer:

    14

    Step-by-step explanation:

    7/5. = x/ x- 4 (the ratio to each other is the same)

    cross multiply

    7x-28 = 5x

    simplified: -2x = -28

    divide x and -28 by -2

    x= 14

    x= # of girls

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )