CAT Practice : Averages, Ratios, Mixtures

When we mix two mixtures in a particular ratio, we get a third mixture. Given the third mixture how does one find the ratio in which they were mixed.


    Q.31: What is the ratio in which water should be mixed with a coke concentrate costing Rs 15/litre to make a profit of 30% by selling the resultant drink at Rs 18/litre
    1. 12:1
    2. 11:1
    3. 1:10
    4. 1:12


  • Correct Answer
    Choice D. 1:12

Detailed Solution

C.P. to get 30% profit at Rs 18/litre =

= )
= ) 1: 12
Note: Make sure you don’t mark 12:1 since in the question, water has been mentioned first. This can be a silly trap to fall into after all the hard work.

Correct Answer: 1:12

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