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A millionaire bought a job lot of hats 1/4 of which were brown. He sold 2/3 of the hats including 4/5 of the brown hats. What fraction of the unsold hats were brown.
Explanation :
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X=number of hats
1/4x=brown hats
1/5*1/4x=Brown hats unsold
1/3=total number of hats unsold
Hence ratio
1/20x ÷ 1/3x=3/20
