Mathematics

Mittens

9 December, 11:56

Mrs. Henderson has 60 pens and pencils in her desk. She knows that she has twice as many pencils as pens. She writes the expression 2x + x for the total number of pens and pencils, where x is the number of pens. Which number in the set {15, 20, 25, 30} makes this expression equal to 60?

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