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Nadusha1986 [10]
3 years ago
14

A teacher has 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:
Kobotan [32]3 years ago
5 0
21/3 is 7 so there are 7 pens for every 1 ratio
7 x 1 = 7
21+7 = 28
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