Bill is doing weight training before trying out for the boxing team. He gets two 2-gallon jugs and fills them 70% full with sand. If sand has a density of 5 pounds/gallon, how many pounds do Bill's improvised weights weigh?
First find the volume of the sand in one jug: 2 gallons * 70% = <<2*70*.01=1.4>>1.4 gallons
Then double this amount since there are two jugs: 1.4 gallons * 2 = <<1.4*2=2.8>>2.8 gallons
Then multiply the total volume by the density of sand to find the total weight: 2.8 gallons * 5 pounds/gallon = <<2.8*5=14>>14 pounds
#### 14