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21 September, 06:06

Forty students are In Science club. Of those 45% are girls. This percent increase 56% after new girls join the club. How many new girls joined?

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  1. 21 September, 06:17
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    45% of 40 is 0.45*40=18 girls

    if x girls join then 56% of 40+x is 0.56 (40+x) = 18+x

    22.4+0.56x=18+x

    put together like terms

    4.4=0.44x

    x=10 girls joined
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