Averages and Mixtures are easy topics to crack once you have had sufficient practice. The question in CAT 2019 is no different. Almost all **CAT previous year paper** would have a mixtures question that you can practice from.

Question 25 : A chemist mixes two liquids 1 and 2. One litre of liquid 1 weighs 1 kg and one litre of liquid 2 weighs 800 gm. If half litre of the mixture weighs 480 gm, then the percentage of liquid 1 in the mixture, in terms of volume, is

- 70
- 85
- 80
- 75

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In Liquid L1 - 1L = 1000 grams

So, 1000 mL = 1000 grams

1 mL = 1 gram

x mL = x grams

In Liquid L2 - 1L = 800 grams

1000 mL = 800 grams

1mL = 0.8 grams

(500-x) mL = (500-x) x 0.8 grams

Total mass = x + 400 - 0.8x = 480 grams

0.2x = 80 grams

x = 400 grams

Therefore, Liquid 1 has 400 mL and Liquid 2 has 500 - 400 = 100 Ml

Therefore, Percentage of Liquid 1 = x 100 = 80%

The question is **"A chemist mixes two liquids 1 and 2. One litre of liquid 1 weighs 1 kg and one litre of liquid 2 weighs 800 gm. If half litre of the mixture weighs 480 gm, then the percentage of liquid 1 in the mixture, in terms of volume, is " **

**Choice C** is the correct answer.

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