The average weight of six members of a family is 30 kg. If the head of the family is not considered, the average weight of the rest is 5 kg less than the earlier average. Find the weight of the head of the family.

A55 kg ✓ Correct

B53 kg

C60 kg

D57 kg

Correct answer: (A) 55 kg

Explanation

The head of the family weighs 55 kg.

Total weight of six members = 6 x 30 = 180 kg.

The other five average 30 - 5 = 25 kg, totalling 5 x 25 = 125 kg.

Head's weight = 180 - 125.

= 55 kg.

Want more like this? Create a free account to practise a full test, track your progress, and get spaced-repetition review.