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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?

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?
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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?

User Venomy
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1 Answer

3 votes
x - blue pens


(21)/(x)=(3)/(1)\\ 3x=21\\ x=7\\\\ 21+7=28

28 in total

User Sybind
by
7.7k points
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