Question

A piece of red ribbon is 2 m 20 cm long. Half of this red ribbon is cut and stitched with a piece of blue ribbon. If the total length of the ribbons joined in this manner is 4 m 25 cm, what is the length of the blue ribbon?

Answer 1

Length of the piece of red ribbon = 2 m 20 cm
= 200 cm + 20 cm = 220 cm

Half of this red ribbon = 220 cm ÷ 2 = 110 cm

Hence, 110 cm of red ribbon has been joined with blue ribbon.

Total length of ribbons joined in this manner = 4 m 25 cm
= 400 cm + 25 cm
= 425 cm

We need to remove part of the red ribbon from 425 cm to get the length of the blue ribbon.

Length of the blue ribbon = 425 cm - 110 cm = 315 cm
= 300 cm + 15 cm
= 3 m 15 cm