posted by jake on .
One day we decided to drive from Town A to Town D. In order to get there we had to drive through Town B and then Town C. It is 10 miles farther from Town A to Town B than it is from Town B to C. IT is 10 miles farther from Town B to Town C than it is from Town C to Town D. It is 330 miles from Town A to Town D. How far is it from Town A to Town B?
let the distance from c --> d be x
if b --> c is ten miles farther than x, then let that distance be x+10
same for a --> b. it is 10 further than
b --> c (x+10), so it would be x+10+10, or x+20
so look at it like so:
the total distance is (x+20)+(x+10)+x = 330, or 3x+30=330
divede by 3, and x=100 miles.
to get a->b, u do 100+20=120 miles
the -30 -30 was subtract 30 from both sides. it lined up in the box but not when posted -_-