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?

Question

Mathematics

Sanford

8 February, 10:16

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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Answers (1)

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George Lynn · Answer 1

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