(-18-23+20)/3= (-21)/3=-7
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To find the average you need to add the two numbers together and divide by two. 18 + 22 = 40 40 / 2 = 20 The answer is 20.
For any set of numbers n-1, n, and n+1, the average will be n. For example, if the numbers are 18, 19, 20, the average will be 19.
20+18+13+9=60
2 times -20 equals 40 and 2 plus -20 equals -18
109 you can plus like this: (19+1)+20+20+(1+1+18)+4+25