Mathematics, 18.08.2019 15:50, AgentPangolin

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

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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 a...