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17 December, 02:57

The ratio of girls to boys in the grade is 7 to 8. If there are 140 girls, how many boys are there

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  1. 17 December, 03:13
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    there are 160 boys in the grade
  2. 17 December, 03:19
    0
    There are 160 boys.

    Set up a proportion:

    the ratio of girls to boys is 7/8, we don't know how many boys there are but we know that there are 140 girls.

    7/8 = 140/x

    Make sure that girls and girls are across from each other in the proportion. 7 should be across from 140. 8 is across from x. X represents how many boys there are.

    Solve for X (the amount of boys) and you get 160 boys.

    And you can always check your answer by plugging it back into the problem.
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