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Another alternative.

file ——- 3/4 pen

4 files ——- 3 pens

3/7 of his money ——- 16 files + 3 pens = 20 files = 15 pens

1/7 of his money ——- 15/3 = 5 pens

1 – (3/7) = 4/7

4/7 of his money ——- 5 pens + some files 

4/7 – 1/7 = 3/7

3/7 of his money ——- 20 files

20 + 16 = 36

Ans : 36 files.

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Hope that this model explains the concept sufficiently.

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