 # A 20% ethanol solution is mixed | Quantitative Aptitude – Arithmetic – Mixtures

### CAT Verbal Ability

CAT 2018 – The CAT QA section has grown increasingly difficult since 2015. In order to tackle the tougher CAT Level QA questions for the CAT Exam, it is important to understand the basics of CAT. To obtain a great CAT score, make use of MBAP Free Study material with detailed solutions and video explanations. Check out MBAP free Mock test to take these questions in a test format for free.

### You may also find remaining question solution of CAT 2018, Slot-2 by searching the question in the search bar.

The question below is from previous year CAT question from CAT 2018 exam comes from CAT Arithmetic – Mixtures – A 20% ethanol solution is mixed…. Find out by answering this question which tests an aspirant’s Quantitative Ability Skills:

## CAT 2018 – Slot -2 - Question 4 - A 20% ethanol solution is mixed

Q. 4: A 20% ethanol solution is mixed with another ethanol solution, say, S of unknown concentration in the proportion 1:3 by volume. This mixture is then mixed with an equal volume of 20% ethanol solution. If the resultant mixture is a 31.25% ethanol solution, then the unknown concentration of S is

1. 52%
2. 50%
3. 55%
4. 48%

Let the volume of 20% ethanol solution in first mixtures = x so

Volume of S = 3x

Total volume of first solution = 4x

Total volume of final solution =2×4x=8x

Volume of ethanol solution in final mixture = x + 4x = 5x ,

So volume of S in final solution = 3x

Thus (31.25-20)/(s-31.25) = 3x/5x = 3/5

56.25=3s-93.75

3s=150

s=50% Counselling Session
By IIM Mentor

#### Free Material Area  