Question 156715
x+(x+2)+(x+4)=150
3x+6=150
3x=150-6
3x=144
x=144/3
x=48 the smallest even number.
48+2=50 the middle even number
48+4=52 the larest even number.
Proof:
48=50=52=150
150=150
SHORTCUT: 
150/3=50 THIS IS THE MIDDLE NUMBER (X+2)