Question

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.

Answer 1

Explanation:

What is known....AC=75 AB=4 times BC AB+BC=AC

4(BC)+BC=75 Add like numbers

4(BC)+BC=5BC

5(BC)=75 get the variable(BC) alone by dividing both sides by the number(5)

5(BC)/5=75/5 Then simplify....5(BC)/5=(BC) and 75/7=15

(BC)=15