Question

ABC is a straight line.The length of AB is four times the length of BC.AC=75

Work out the length of AB

Answer 1

AB = 60

Explanation:

Given AC = 75 and AB = 4BC, then

AB + BC = AC, that is

4BC + BC = 75

5BC = 75 ( divide both sides by 5 )

BC = 15

Thus

AB = 4BC = 4 × 15 = 60