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???
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
