Given :
Total mass , M = 1015 pounds .
Also ,
Bushel = 25 lbs
box = 10 lbs
bag = 5 lbs
To Find :
How many pounds of apples does Mason have left .
Solution :
Total pounds he sells :

So , pounds of apples left .

Therefore , pounds of apples left 340 lb .
Hence , this is the required solution .