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4 boys and 3 girls spent ₹120 on average, of which the boys spent ₹150 on average. Then the average amount spent by the girls is:

1. ₹ 80
2. ₹ 60
3. ₹ 90
4. ₹ 100

Correct answer: ₹ 80

Solution

The total spent by 7 children is 7 × 120 = 840. The boys spent 4 × 150 = 600, so the girls spent 840 - 600 = 240; dividing by 3 gives 80.

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