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a teacher had 21 red pens. if the ratio of red pens to blue pens owned was 3:1 how many pens did she have in total
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a teacher had 21 red pens. if the ratio of red pens to blue pens owned was 3:1 how many pens did she have in total

User Stanislav Ageev
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If the ratio of red to blue pens is 3:1, we can find the amount of blue pens by multiplying by 1/3, to get 21*1/3=7.  There are 21 red pens and 7 blue pens, so there are 21+7=28 pens total.
User Lars Schirrmeister
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