Add the 4 numbers and divide by 4.
answer = 100/4 = 25
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25
10 plus 20 plus 30plus 40 plus 50 equals 150 because 50 plus 40 equals 90 plus 30 =120+20= 140 then + 10 = 150
10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, . . .5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, . . .