Mathematics, 26.09.2019 06:50, sylviawilliams04

Ateacher 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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Ateacher had 21 red pens. if the ratio of red pens to blue pens owned was 3: 1 how many pens did she...