Question:
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
- 85
- 70
- 75
- 80
Correct Answer: Option: 4
Weight of liquid 1 per litre = 1000 gm
Weight of liquid 2 per litre = 800 gm
Weight of mixture per litre = 2×480=960 gm
Applying alligation rule
$\frac{Quantity\ of\ liquid\ 1}{Quantity\ of\ liquid\ 2}=\frac{960-800}{1000-960}=\frac{4}{1}$
Therefore, the liquids are mixed in 4:1.
Hence, the percentage of liquid 1 =$\left( \frac{4}{4+1} \right)\times 100=80%$
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