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6 February, 17:57

ABC is a straight line.

+

H

B

C

The length AB is five times the length BC.

AC = 90 cm.

Work out the length AB.

AB = cm

+1
Answers (1)
  1. 6 February, 19:52
    0
    AB = 75 cm

    Step-by-step explanation:

    Since ABC is a straight line, then

    AB + BC = AC

    let BC be x then AB = 5x and summing gives

    5x + x = 90

    6x = 90 (divide both sides by 6)

    x = 15

    Thus

    AB = 5x = 5 * 15 = 75 cm
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