# Mr Tan has an equal number of pens and pencils. He puts the pens in bundles of 8 and the pencils in bundles of 12. There are 15 bundles altogether. How many pens are there?

Let x number of bundles of the pen be there, then there is 15-x number of bundles of the pencil. The total number of pen and pencil are the same.

That is

8x=12(15-x)

8x=180-12x

20x=180

x=9

That is there are 9 bundles of pen and 6 bundles of pencil

Verification

9 x 8=72

12 x 6= 72

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