Mark sold $2 each. he receive less than $80 from the sale find the greatest possible number of pens

80<2x            (x = # of pens)
/2    /2
40<x
 
39 pens at most

Well in order to lose a pound you would have to burn 1,500 calories. the more calories you burn the more weight you lose. in order to lose 2 pounds you would have to run 4 hours and 28 minutes.