Multiple choice

In what ratio must a shopkeeper have to mix the two varieties of rice costing Rs 28 and Rs 40 per kg respectively so as to get a mixture worth Rs 36 per kg ?

  1. 4 : 7

  2. 2 : 3

  3. 1 : 2

  4. 5 : 8

  5. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Use allegation method: The difference between mean price (36) and each price gives the ratio. Cost of cheaper rice: Rs 28, Cost of costlier rice: Rs 40, Mean price: Rs 36. Using allegation: (40 - 36) : (36 - 28) = 4 : 8 = 1 : 2. So the ratio is 1 : 2.

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