Out of 100 members of a group 20% likes tea, 50% of the rest likes coffee and the rest likes milk. A glass of milk gives 10 units of energy, a cup of coffee gives 8 units of energy and a cup of tea is good enough for 15 units of energy. Find the average of the units of energy that the members of the group gained.

Out of 100 members of a group 20% likes tea, 50% of the rest likes coffee and the rest likes milk. A glass of milk gives 10 units of energy, a cup of coffee gives 8 units of energy and a cup of tea is good enough for 15 units of energy. Find the average of the units of energy that the members of the group gained. Correct Answer 12.2 units

People who like tea = 20% of 100 = 20 People who like coffee = 50% of the remaining = 50 % of 80 = 40 People who like milk = remaining = 40 Energy gained = 10 units per serving of milk, 8 units per serving of coffee and 15 units per serving of tea. Total energy gained = 20 * 15 + 40 * 8 + 40 * 15 = 300 + 320 + 600 = 1220 Average of the energy gained = 1220 / 100 = 12.2 units per serving.
Bissoy MCQ

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