Question

how many planks of dimensions 5m x 25 cm x 10 cm can be stored in a pit which is 20m long ,6m wide and 80 cm deep?

Answer 1

volume of plank= 5m*25/100*10/100= 1/8=0.125 m^3
volume of pit = 20 *6*80/100=96m^3
no of planks = volume of pit /volume of plank =96/0.125  =768

Answer 2

volume of one plank(v) = 5m x 0.25m x 0.1m = 0.125m³
volume of pit (V) = 20m x 6m x 0.8m = 96m³
no. of planks = V/v = 96/0.125 = 768 planks