Explanation:
let the smallest number be x.
the 3 numbers are :
x
x+1
x+2
x+(x+1)+(x+2) = 636
3x+3 = 636
3x = 633
x = 211
therefore, x+1 = 211+1 = 212, x+2 = 211+2 = 213
the 3 numbers are 211, 212, and 213
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