MATH

if line segment AC =120ft and the ratio of line AB:line BC=3:5, what is the length of line AB ?
I set up the equation as x:120,3:5
x/120=3/5 3/120=360, 360 divided by 5=72
the answer in the book is 45, need help

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asked by Rose
  1. It should have been x/120 = 3/8
    which gives x = 45

    notice AB:BC = 3:5
    so AB could be 3 units, BC 5 units, making AC 8 units.

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    posted by Reiny

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