Now, average age of the school = | Total age of the boys + Total age of the girls |
600 |
⇒ 11 | 3 | = | 12(600 – x) + 11x |
4 | 600 |
⇒ | 47 | = | 7200 – x |
4 | 600 |
∴ Quantity of milk in first year = | 4080 | = 544 litres |
7.50 |
∴ Quantity of milk in second year = | 4080 | = 510 litres |
8.00 |
∴ Quantity of milk in third year = | 4080 | = 480 litres |
8.50 |
∴ Required average = | 3 × 4080 | = | 12240 | = ₹ 7.98 |
544 + 510 + 480 |
1534 |