Question

Tony required 4 pieces of wood each of which are 68 cm long if wood is sold in 2 metre or 3 metre length

Answer 1

a) Length of wood required by Tony = 4 ××  68 cm = 272 cm

Now, 

272 cm = 200 cm + 72 cm = 2 m 72 cm        (1 m = 100 cm)
 
Therefore, Tony should buy a wood of length 3 metre.

b) Now, 3 m = 300 cm

Length of wood left unused = 300 −-  272 = 28 cm

Answer 2

Hi pls give thanks! 

 a) Length of wood required by Tony = 4 ××  68 cm = 272 cm
Now, 
272 cm = 200 cm + 72 cm = 2 m 72 cm        (1 m = 100 cm) Therefore, Tony should buy a wood of length 3 metre.
b) Now, 3 m = 300 cm
Length of wood left unused = 300 −-  272 = 28 cm