The length of the AC segment is 20% of the length of the AB segment. Find the length of the AB segment if CB = 20cm.

Let the length of the entire segment of av = x cm, express 20% through a relative dimensionless value:

20% / 100 = 0.2, then the segment of ac = 0.2x (cm), and the entire segment Av = x = ac + sv = 0.2x + 20

Let this equation:

x = 0.2x + 20;

x – 0.2x = 20;

0.8x = 20;

x = 20 / 0.8 = 25 (cm);

Av = x = 25 cm.

Answer: Av = 25 cm.