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1. If the average of the four numbers M, 2M+3, 3M-5 and 5M+1 is 63, what is the value of M?
- A. 23
- B. 23
- C. 23
- D. 23
Answer: Option A
Explanation:
(M + 2M + 3 + 3M - 5 + 5M + 1) / 4 = 63
or, (11M - 1) = 63 * 4
or, 11M = 252 + 1
or, 11M = 253
or, M = 253 / 11
or, M = 23
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