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At a banquet the ratio if the number of boys to the number of girls is 5:3. Halfway tjrough the banquet 20 boys leave and the ratio bexomes 5:4. How many girls are at thebbanquet?

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Anonymous

  1. let the number of boys be 5x
    let the number of girls be 3x

    during banket, 20 boys leave
    (5x-20)/3x = 5/4
    20x - 80 = 15x
    5x = 80
    x = 16

    number of girls is 3x or 48.

    check:
    original:
    boys = 80
    girls = 48

    after leaving:
    boys = 60
    girls = 48
    ratio is 60:48 = 5 : 4

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    Reiny

  2. reiny can you explain the equation more? is the / a division symbol? i still don't understand how you got 16.

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    .@reiny

  4. 48

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    Pal

  5. ratios are fractions so yes the "/" is a division sign. the 2 ratios become 5/3=5/4, but you have to incorporate the minus 20. So 5x-20 represent to boys, and 3x is the girls then to make it equate the 5:4 ratio you place it in an algebraic equation and cross multiply. (5x-20) X 4= 3x X 5 = 20x-80= 15x
    20x-15x= 80 = 5x=80 or x =80/5 which equals 16,so x =16.

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    Anonymous

  6. Where you get the 80 from...?

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    Anonymous

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