This promblem includes integers
what are four consecutive integers whose sum is 86?
suiye is right, and that way is probably even quicker, but another way to arrive at the answer is to set up an equation
four consecutive integers: x, (x+1), (x+2), and (x+3)
sum them up and get 86
x + x+1 + x+2 + x+3 = 86
now solve for x, the smallest one
4x + 6 = 86
4x = 80
x = 20
so the numbers are 20, 21, 22, and 23
20,21,22,23. the way to approach this is divide 86 by 4 you will get 21.5. You need intergers, so you can starting at 20 or 21 and increment by 1 to see if they sum up to be 86.