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13/60
ABC is a straight line.

A
B
С
The length of AB is four times the length of BC.
AC = 75 cm.
Work out the length of AB.

Answer 1

AB = 60cm
BC = 15 cm

Call AB x and BC y

x = 4y
And
x + y = 75

Substitute the first value intro eh second equation & solve for a numerical value for y

4y + y = 75
5y = 75
y = 15
Then solve for a numerical value of x

x = 4y
x = 4(15) = 60