The length of a wooden block is 7 m 5 cm long. Opal cut the wooden block into 3 pieces. The length of the first piece of the wooden block is 59 cm. The length of the second piece of the wooden block is 5 m shorter than the third piece. What is the length of the third piece of wooden block?
1 m = 100 cm

Difference in the length between the second and the third piece
= 5 m
= 5 x 100
= 500 cm

Length of a wooden block
= 7 m 5 cm
= 7 x 100 + 5
= 705 cm

Length of the first piece = 59 cm
Length of the second piece = 1 u
Length of the third piece = 1 u + 500 cm

1 u + 1 u + 500 + 59 = 705
2 u + 559 = 705
2 u = 705 - 559 = 146
1 u = 146 ÷ 2 = 73 

Length of the third piece of wooden block
= 1 u + 500
= 73 + 500
= 573 cm

Answer(s): 573 cm