Asked by LARA
Mrs Koh bought some pens, files and erasers. The ratio of the number of pens to the number of files to the number of erasers she bought was 1 : 2 : 3. The cost of each pen and eraser is $2.50 and $0.50 respectively. If she spent $60 on the pens and the erasers, how many files did she buy?
Answers
Answered by
Steve
Say she bought x pens, 2x files, and 3x erasers. Adding up the cost of the pens and erasers, we have
2.50x + 0.50(3x) = 60.00
x = 15
So, she bought 30 files
2.50x + 0.50(3x) = 60.00
x = 15
So, she bought 30 files
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