Discussion
The average of 40,50,60 and 70 is:
Answer: C
The average is 55. The sum of 40, 50, 60 and 70 is 220, and dividing by 4 gives 55. 50 is the average of only the first three, 45 would be too low for these numbers, and 65 is above the middle of the set. The four numbers are evenly spaced with a difference of 10, so their average is also the midpoint of the first and the last, (40 + 70)/2 = 55.
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