The ratio of adults to girls to boys on a class field trip was 1:4:5. If the trip included 6 more boys than girls, how many adults were with the group?
A. 3
B. 4
C. 6
D. 8
E. 12

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  1. adults --- x
    girls ----- 4x
    boys ------5x
    (note x: 4x : 5x = 1 : 4 : 5)

    "6 more boys than girls" ---> 5x = 4x+6
    x = 6

    so we had 6 adults, 24 girls, and 30 boys, (satisfying all our conditions stated)

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    posted by Reiny

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