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4 boys and 3 girls spent ₹ 120 on the average, of which boys spent ₹ 150 on the average. Then the average amount spent by the girls is
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- ₹ 80
- ₹ 60
- ₹ 90
- ₹ 100
- ₹ 80
Correct Option: A
The average of 4 boys and 3 girls on expenditure = ₹ 120
Total expenditure = 120 × 7 = Rs. 840
The average of 4 boys on expenditure = ₹ 150
Total expenditure of 4 boys = 150 × 4 = 600
Total expenditure of 3 girls = Total expenditure - Total expenditure of 4 boys
Total expenditure of 3 girls = 840 – 600 = 240
| ∴ Their average expenditure = | = 80 | |
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