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The average of five results is 46 and that of the first four is 45. The fifth result is__________?

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The average of five results is 46 and that of the first four is 45. The fifth result is__________?

A. 1
B. 10
C. 12.5
D. 50
Explanation:
5 * 46 – 4 * 45 = 50