P3 Systematic Listing

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Aaron has less than 30 pens in a box. When he ties the pens in bundles of 6, he has 3 pens left. When he ties them in bundles of 9 , he has none left. How many pens does he have in the box ? C1 C2 x6 6 12 18 24 30 x9 9 18 27 36 +3 9 15 21 27 33 +/-0 9 18 27 36 Ans.: 27

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