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The ratio of A to B is 3:4, and the average of A, B and C is 40. If the average of A and B is 35, then find the value of C.

1. 30
2. 40
3. 50
4. 60

Correct answer: 50

Solution

Average of A and B is 35, so A + B = 70. The average of A, B, and C is 40, so A + B + C = 120. Therefore, C = 120 - 70 = 50.

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