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CAT 2019 Slot 1 — QA Question 5

AlligationEasy

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

Answer & solution

  • A

    70

  • B

    85

  • 80

  • D

    75

Solution

Density of liquid 1 = 1000 g/L.

Density of liquid 2 = 800 g/L.

Half litre of the mixture weighs 480 gm, so 1 L of the mixture weighs 960 gm.

So, density of the mixture = 960 g/L.  

Using the alligation cross;

Liquid 1Liquid 2=(960-800)(1000-960) = 41.

Percentage of liquid 1 in the mixture = (4/5) × 100 = 80%.

Hence, option (c). 

CAT 2019 Slot 1 QA Q5: 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 — Solution | TheCATExam