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21 October, 15:25

ABC is a straight line

The length of AB is four times the length of BC.

AC = 75 cm

Work out the length of AB.

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Answers (2)
  1. 21 October, 15:29
    0
    AB = 60 cm

    Step-by-step explanation:

    AC = AB + BC

    75 = AB + AB/4

    4*75 = 4AB + AB

    300 = 5AB

    AB = 300/5

    AB = 60 cm
  2. 21 October, 15:43
    0
    Answer: Length of AB = 60cm

    Step-by-step explanation: ABC is a straight line

    Let the length of AB and BC be x and y respectively

    x = 4y

    y = y

    ∴4y+y = 75

    5y=75

    →y = 15

    →x = 4y

    ∴x = 4*15 = 60cm

    ∴AB (x) = 60cm

    ∴BC (y) = 15cm
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