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.

Alligation

    Q.32: A mixture of 40 litres of milk and water, contains 20% of water. How much water must be added to the above mixture to make the water 25% of the resultant mixture?
    1. 3 l
    2. 2.33 l
    3. 2.67 l
    4. 4 l

 

  • Correct Answer
    Choice C. 2.67 l

Detailed Solution

Focus on water since it is the item of interest in the question.
Therefore,

Therefore,
Mixture: Water = 15:1 = ) litres of water must be added = 2.67 l




Correct Answer: 2.67 l



Our Online Course, Now on Google Playstore!

2IIM's App

Fully Functional Course on Mobile

All features of the online course, including the classes, discussion board, quizes and more, on a mobile platform.


Cache Content for Offline Viewing

Download videos onto your mobile so you can learn on the fly, even when the network gets choppy!

Get it on Google Play