The dimension of the plank areLength =5m=500cmBreadth =25cmHeight =10cmWe know thatVolume of the plank =1×b×hBy substituting the values Volume of the plank =500×25×10So we getVolume of the plank =125000 cm3The dimension of the pit areLength =20m=2000 cmBreadth =6m=600 cmHeight =80cmWe know thatVolume of one pit =1×b×hBy substituting the valuesVolume of one pit =2000×600×80So we getVolume of one pit =9600000cm3So the number of plank that can be stored = Volume of one pit /Volume of plankNumber of planks that can be stored =1250009600000​So we getNumber of planks that can be stored =768Therefore, the number of planks that can be stored is 768.