Question 949558
x=first number; x+1=second; x+2=third
x+x+2=3(X+1)-21
2x+2=3x+3-21
2x+2=3x-18 Add 18 to each side.
2x+20=3x Subtract 2x from each side.
20=x ANSWER The first number is 20, the second 21, and the third 22.
CHECK
x+(x+2)=3(X+1)-21
20+22=3(21)-21
42=63-21
42=42