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Answer on Algebra Question for Lori

Question #2648
Jacob has 100 sports cards. He has football, basketball, and baseball cards. Use these clues to find out how many of each type he owns.

He has three time as many football cards as basketball cards.
He has 10 more basketball cards than baseball cards.
Expert's answer
Denote football cards as Fb, basketball cards as Bk, baseball cards as Bs. Let's construct the system of equations:
Fb + Bk + Bs = 100
Fb = 3Bk
Bk = Bs + 10

Fb = 3(Bs + 10)
3(Bs + 10) + Bs + 10 + Bs = 100
5Bs = 100 - 40 = 60
Bs = 12,& Bk = 12+10 = 22,& Fb = 22*3 = 66.

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