There are 3 pieces of strings with a total length of 3 m 88 cm. The first piece of string is 47 cm more than the second piece of string while the third piece is thrice the length of the first piece of string. Calculate the length of the third piece of string. (Write the answer in metres and centimetres.)
Length of the first piece = 1 u
Length of the second piece = 1 u - 47
Length of the third piece = 3 u

Total length
= 1 u + 1 u - 47 + 3 u 
= 5 u - 47

Total length of 3 pieces of strings
= 3 m 88 cm
= 3 x 100 + 88
= 388 cm

5 u - 47 = 388 
5 u = 388 + 47 = 435
1 u = 435 ÷ 5 = 87 

Length of third piece of string
= 3 u
= 3 x 87
= 261 cm

1 m = 100 cm
261 cm = 2 m 61 cm

Length of third piece of string = 2 m 61 cm

Answer(s): 2 m 61 cm