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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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lelee2

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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