Q102
ArithmeticPercentage, Profit & Loss
When water is frozen to ice, its volume increases by 10%. What percent of the volume of ice decreases when it melts to water?
- a.$10\frac{1}{11}$%
- b.$6\frac{1}{5}$%
- c.$9\frac{1}{11}$%
- d.11%
Answer: (C) $9\frac{1}{11}$%
100 units of water become 110 units of ice; on melting, 110 falls back to 100. The decrease is 10 out of 110, i.e. $\frac{100}{11} = 9\frac{1}{11}$%. 10% or more would measure the change against the water volume instead of the ice.