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A library has 142 CDs on its shelves. There are 11 shelves that have 8 CDs on each shelf. The rest of the shelves have 6 CDs on each shelf. How many shelves have 6 CDs?

Respuesta :

bcalle
11(8) + 6x = 142
88 + 6x = 142
Subtract 88 from both sides
6x = 54
Divide both sides by 6
x = 9
9 shelves have 6 CD's
11x8=88
142-88=54
54 divided by 6 is 9
So 9 is the answer.

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