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A millionaire bought a lot of hats 1/...

A millionaire bought a lot of hats `1/4` of which were brown. The millionaire sold `2/3` of the hats including `4/5` of the brown hats. What fraction of the unsold hats were brown? `1/(60)` (b) `1/(15)` (c) `3/(20)` (d) `3/5` (e) `3/4`

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