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Railways PYQCBT 1 2016

RRB NTPC · Question 69

In what ratio should Assam Tea costing Rs. 300 per kg be mixed with Darjeeling Tea costing Rs. 400 per kg, so that by selling the mixture at Rs. 408 per kg there is gain of 20%.

  1. 1 : 2

  2. 3 : 2

  3. 2 : 5

  4. 1 : 6

Show answer & explanation

Answer: (B) 3 : 2

Explanation

Selling at Rs 408 for a 20% gain means the mixture costs 408/1.2 = Rs 340 per kg. By alligation, Assam : Darjeeling = (400 − 340) : (340 − 300) = 60 : 40 = 3 : 2.