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Nine students of a class contribute a certain sum of money. Seven of them gave Rs. 50 each and the other two gave respectively Rs. 50 and Rs. 90 more than the others. The average contribution of the class of 9 students is :
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- Rs. 70
- Rs. 50
- Rs. 100
- Rs. 120
- Rs. 70
Correct Option: A
Let Average contribution of 9 students of the class = Rs. p
According to the question,
| ∴ x = | ||
| 9 |
⇒ 350 + 2p + 140 = 9p
⇒ 9p – 2p = 490
⇒ 7p = 490
| ⇒ p = | = Rs. 70 | |
| 7 |
