ordered 9 more copies of a biobook at 89 than copies of the chem book at $74. You spent $3246

how many copies of each?
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1 Answer

number of chem books --> x

number of bio books --> x+9

89x +(x+9)*74= 3246

89x +74x +666= 3246 \-666

163x=2580 \ :163

number of chem books --> 15.828

number of bio books --> 24.828
by Level 1 User (620 points)

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