a) 29%
b) 49%
c) 31%
d) 71%
Answer: a
Explanation: Amount of alcohol in first vessel,
= 25% of 2 litre
= 0.25 × 2 = 0.5 litre
Amount of alcohol in second vessel,
= 40% of 6 litre
= 0.4 × 6 = 2.4 litre
Total amount of alcohol out of 10 litres of mixture is
0.5 + 2.4 = 2.9 litre
Concentration of the mixture is,
$$\frac{{2.9 \times 100}}{{10}}$$
= 29%
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