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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 in total
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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 in total

User Axcelenator
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The teacher had 21 red pens and ? Blue pens. The ratio is 3:1 Divide 21 ÷ 3 21 ÷ 3 =7 Now multiply 1 × 7 Add 21 + 7 Your answer is 28 pens in total.
User Coulix
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