If 2 cubic feet of sand weigh 90pounds, how much do 5 cubic feet of sand weigh?

If 2 cubic feet weigh 90 punds,
you know that 1 cubic weigh 45 punds
now multiply it by 5, therefore 5 cubic feet of sand weigh 225 punds

2 = 90
1 = 45     //divided by 2
5 = 225   //times 5

5 cubic feet of sand weigh 225 punds

72 is the mode because it shows up the most number of times