Answer:
1680
Step-by-step explanation:
280 x 6 = 1680
I’m pretty sure This rounds to 900
X+(x+2)+(x+4)=3639
3x+6=3639
3x=3633
X=1211
Numbers are: 1211, 1213, 1215
X+(x+2)+(x+4)=672
3x+6=672
3x=666
X=222
Numbers are: 222,224,226
<em>x = 8</em>
Step-by-step explanation:
Add 1 to both sides.
Add 2x to both sides.
Divide 40 by 5.
x = 8