Question

The sum of 3 consecutive odd integers is -21. Find the "middle" number.
A. -9
B. -3
C. -7
D. -5

Answer 1

let the numbers are x, x+2, and x+4
the expression will satisfied :
x + x + 2 + x + 4 = -21
3x + 6 = -21
3x = -21 - 6
3x = -27
x = -27/3
x = -9
so, they are -9, -9+2, -9+4 or
-9, -7, -5
as the middle is -7