The length of a metallic rod is 7 m 5 cm long. Ivory cut the metallic rod into 3 pieces. The length of the first piece of the metallic rod is 33 cm. The length of the second piece of the metallic rod is 3 m shorter than the third piece. What is the length of the third piece of metallic rod?
1 m = 100 cm

Difference in the length between the second and the third piece
= 3 m
= 3 x 100
= 300 cm

Length of a metallic rod
= 7 m 5 cm
= 7 x 100 + 5
= 705 cm

Length of the first piece = 33 cm
Length of the second piece = 1 u
Length of the third piece = 1 u + 300 cm

1 u + 1 u + 300 + 33 = 705
2 u + 333 = 705
2 u = 705 - 333 = 372
1 u = 372 ÷ 2 = 186 

Length of the third piece of metallic rod
= 1 u + 300
= 186 + 300
= 486 cm

Answer(s): 486 cm