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  • 06-10-2016
  • Mathematics
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A teacher had 21 red pens. If the ratio of red pens to blue pens she owned 3:1, how many pens did she have total?

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ItsYourBirthday
ItsYourBirthday ItsYourBirthday
  • 06-10-2016
She owned 7 blue pens
21:7
She has 28 pens
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