math

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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?

  • math -

    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:
    a --x+20->b--x+10->c--x->d
    the total distance is (x+20)+(x+10)+x = 330, or 3x+30=330
    -30 -30
    3x=300
    divede by 3, and x=100 miles.
    to get a->b, u do 100+20=120 miles

  • math -

    the -30 -30 was subtract 30 from both sides. it lined up in the box but not when posted -_-

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