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A group of 4 boys and 3 girls spent an average of Rs 120 each, while the boys alone spent an average of Rs 150 each. What was the average amount spent by the girls?

1. Rs 80
2. Rs 60
3. Rs 90
4. Rs 100

Correct answer: Rs 80

Solution

Total spending = 7 x 120 = 840. Boys spent 4 x 150 = 600, so girls spent 840 - 600 = 240. The average for the 3 girls is 240/3 = Rs 80.

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