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5. In a book store, the price of a book is $ 9.
The same book costs $ 12 in a super market.
Julie buys (x + 8) books from the book store.
Sandy buys (x + 4) books from the super market.
(a) If they both pay the same amount, write down an equation in
terms of x
(b) Solve your equation to find the number books each has
purchased.

Sagot :

A. 9(x+8) = 12(x+4)

B. 9x+72 = 12x+48
24=3x
x = 8

Julie bought 16 books (x+8), and Sandy bought 12 books (x+4).
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