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Question

A trader sold total 315 TV sets. He sold black and white TV sets at a loss of 6% and colour TV sets at a profit of 15%. Thus he gains 9% on the whole. The number of black and white TV sets, which he has sold, is : 
 
  1. 126
  2. 216
  3. 135
  4. 90


Solution

The correct option is D 90
Using alligation, we get

Thus the ratio of B/W TV sets to the no. of colour TV sets = 2 : 5
Therefore, no. of B/W TV sets = 27×315=90.

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