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8 August, 07:23

I have a pouch with pens and pencils in it. at the moment, the ratio of pens to pencils is 3:5. if phil gives me 3 pens in exchange for 9 of my pencils, i will have an equal number of pens and pencils. how many pens will that be?

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  1. 8 August, 10:23
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    Ratio of pens : pencils = 3 : 5

    Let x be the number of parts

    3x + 3 = 5x - 9

    2x = 12

    x = 6

    Total pens before exchange = 6 x 3 = 18

    Total pens after exchange = 18 + 3 = 21

    Answer: 21 pens
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