I'm having trouble on my math and I can't figure it out. The problem is: Among the fifty children at the book fair, b of them are boys. 30% of the girls at the book fair are younger than 12 years old, while 40% of the boys are at least 12 years old. How many children at the book fair are younger than 12 years old?
WHAT DO I DO???

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14-10-2014
Mathematics

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I'm having trouble on my math and I can't figure it out. The problem is: Among the fifty children at the book fair, b of them are boys. 30% of the girls at the book fair are younger than 12 years old, while 40% of the boys are at least 12 years old. How many children at the book fair are younger than 12 years old?
WHAT DO I DO???

Sagot :

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Cpow Cpow · Answer 1 · 2014-10-14T16:47:44-04:00

Cpow Cpow

14-10-2014

girls= g
boys=b
50=g+b
Now we know that 30% of the girls are younger than 12. That's already half to answer...
We also know that 40% of the boys are OLDER than 12, which leaves 60% of the boys YOUNGER than 12.
This makes us know that 30%+60% out of 50 kids are younger than 12
30%+60%=90%

90% of the kids are younger than 12
90% of 50 is 45

ANSWER: 45 kids are younger than 12

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