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PIT_PIT [208]
4 years ago
8

A teacher had 21 red pens. If the ratio of red pens to blue pens she owned was 3:1, how many pens did she have total?

Mathematics
1 answer:
dimulka [17.4K]4 years ago
6 0
X - blue pens

\dfrac{21}{x}=\dfrac{3}{1}\\
3x=21\\
x=7\\\\
21+7=28

28 in total

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