Question

how many pieces of dimension 25cm ×20cm × 10cm can be made out of a wooden log of dimension 3m ×1m×50cm ?

Answer 1

Number of pieces = volume of wooden log / volume of one small piece 

                             = 3 * 1 * 0.5 / 0.25 * 0.2 * 0.1
 
                             = 30 pieces

Answer 2

3m=300cm,1m=100cm
Volume of wooden blog =300×100×50=1500000cm3
And one piece dimension is 25×20×10=5000cm3

No.of piece=volume of wooden blog/volume of one piece

1500000/5000=300pieces