MATHS

Two different schools (A and B) have the same number of pupils. The ratio of the boys in school A and the boys in school B is 2:1 and the ratio of the girls in school A and the girls in school B is 4:5. Find the ratio of the boys in school A to the girls in school A.

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  1. If school A has a boys and b girls, and school B has c boys and d girls, then

    a/c = 2/1
    b/d = 4/5
    a+b = c+d

    we want to find a/b

    a = 2c
    5b = 4d

    a-c = d-b
    a-(a/2) = (5b/4)-b
    a/2 = b/4
    a/b = 2/4 = 1/2

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  2. 1/2

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  3. Rossi is planning a date with his gilfriend.He plans for them to watch a movie,go out to dinner,and then attend a sporting event. He is dwciding between 555 movies, 888 restaurants,and 222 sporting events.

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