Question

4 points: A,B,C and D are marked in order on a line such that AB:AC = 3:7 and BD:CD= 9:2. If CD is 100cm long, find the length of AB.

Answer 1

You can create equations to find the lengths and how they compare.

The line is in order of A-B-C-D
Both ratios share BC so we can use that to transfer from one ratio to the next.

AB =3x AC=7x
subtract them to find the measurement of BC

AC- AB = BC
7x-3x = 4x . BC = 4x

BD= 9y CD=2y

Subtract them to find the measurement of BC

BD - CD = BC

9y-2y =7y BC =7y

CD is 100cm so 2y= 100 or y=50

substitute y for bc
7(50)=350

substitute BC for terms of x

350 = 4x

divide both sides by 4
X= 87.5

Substitute for AB
AB = 3x

AB = 3(87.5) = 262.5cm