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The average of 8 results is 20. The average of first two results is 15 ½. The average of next three results is 21 1/3. The sixth result is 4 less than the seventh and 7 less than the 8th. Find the last result.

A.	23	B.	22
C.	25	D.	21

Answer and Explanation

Answer:25

Explanation:
Sum of 8 results = 8(20) =160
Sum of first two results = 2(15.5) = 31
Sum of next three results = 3(21 1/3) = 64
The sixth result be x, Seventh result = x+4 Eighth result = x+7
31 + 64 + x + x + 4 + x + 7 = 160
X = 18, so last result = 18+7 =25

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