Answer:
Volume of wood, 

Step-by-step explanation:
It is given that, 
Mass of wood, m = 5250 kg
The density of wood, 

We need to calculate the volume of wood. It can be calculate using the formula of density. It is given by :
 
 
 
 
 
 
 
 
So, the volume of wood is 7 cubic meter. Hence, this is the required solution.