There are 3 pieces of streamers with a total length of 5 m 97 cm. The first piece of streamer is 40 cm more than the second piece of streamer while the third piece is five times the length of the first piece of streamer. Calculate the length of the third piece of streamer. (Write the answer in metres and centimetres.)
Length of the first piece = 1 u
Length of the second piece = 1 u - 40
Length of the third piece = 5 u

Total length
= 1 u + 1 u - 40 + 5 u 
= 7 u - 40

Total length of 3 pieces of streamers
= 5 m 97 cm
= 5 x 100 + 97
= 597 cm

7 u - 40 = 597 
7 u = 597 + 40 = 637
1 u = 637 ÷ 7 = 91 

Length of third piece of streamer
= 5 u
= 5 x 91
= 455 cm

1 m = 100 cm
455 cm = 4 m 55 cm

Length of third piece of streamer = 4 m 55 cm

Answer(s): 4 m 55 cm