# 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

1. 👍 0
2. 👎 0
3. 👁 69
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.

1. 👍 0
2. 👎 0
posted by Reiny

## Similar Questions

1. ### GEOMETRY /PROP.

if line segment AC=120ft and the ratio of line AB:BC =3/5 - what is the length of line AB ? I set up the problem up as X:120 & 3:5 3x120= 360 and divided 5 into 360 = 72ft but the answer in the book is 45ft help!

asked by Rose on October 15, 2008
2. ### maths

the line passes through the points s(6,6) and T(0,-2) determine the gradient of the line the equation of the line the midpoint of the line segment,TS the length of the line segment,TS

asked by shanise on February 23, 2014
3. ### geometry

A triangle is formed where line segment AC and line segment BC have the same length. If the measure of angle ACB = 81 degrees, find the measures of angles x and y so that the top horizontal line will be parallel to the bottom

asked by Sally on July 28, 2010
4. ### Geometry

Yes, I'm this desperate. I just have problems with coming up with the statements for two column proofs. Answers would be appreciated. Given: line segment AX congruent to line segment DX, line segment XB is congruent to XC. Prove:

asked by Derp on October 5, 2010

Quadrilateral WXYZ os describes below. Line segment WX is parallel to line segment YZ. Line segment XY is the same length as line segment ZW. Line segment Xy is not parallel to line segment ZW. Which of the following describes

asked by Grace on April 9, 2015
6. ### mathematics

points P and Q are both in the line segment AB and on the same side of its mid point p divides AB in the ratio 2:3 and Q divides in the ratio 3:4. if PQ=2 then find the length line segment AB

asked by mahe on August 29, 2016
7. ### maths

points A,B,C and D lie on a straight line in the given order. AC=25cm and BD=46cm. the ratio of length CD to length AB is 5/2. find the length of line segment BC in cm.

asked by Anonymous on February 9, 2013
8. ### CAMBRIDGE

Points P and Q are both in the line segment AB and on the same side of its midpoint. P divides AB in the ratio 2 : 3, and Q divides AB in the ratio 3 : 4. If PQ = 2, then find the length of the line segment AB.

asked by YASHIKA on February 21, 2017
9. ### Math

Points P and Q are both in the line segment AB and on the same side of its midpoint. P divides AB in the ratio 2:3, and Q divides AB in the ratio 3:4. If PQ=2, then find the length of the line segment AB.

asked by Samhitha on September 24, 2016
10. ### math

points a,b,c,and d lie on a straight line in the given order. AC = 25 cm and BD = 46 cm. The ratio of length CD to AB is 5/2. Find the length of line segment BC in cm. sorry miss the CD part

asked by jani on October 6, 2010

More Similar Questions