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There were 20% more boys than girls in a swimming club. After 50 girls left, there were twice as many boys as girls in the club. How many boys were there in the club?

  • math -

    b = 1.2g
    b = 2(g-50)
    1.2g = 2g-100
    .8g = 100
    g = 125
    so, b = 150

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