Mr. smith built a rectangular-shaped sandbox for his children, measuring 4 feet by 4 feet by 6 inches. sand has a density of approximately 100 pounds per cubic foot and is sold in 50-pound bags for $3.50 each. how much will it cost mr. smith to completely fill the sandbox? mr. smith built a rectangular-shaped sandbox for his children, measuring 4 feet by 4 feet by 6 inches. sand has a density of approximately 100 pounds per cubic foot and is sold in 50-pound bags for $3.50 each. how much will it cost mr. smith to completely fill the sandbox?

To completely fill the sandbox will cost $56

Step-by-step explanation:

First, we calculate volume of the rectangular-shaped sandbox:

We know that density of sand is 100 pounds per cubic foot. Then, to fill the sand box that has a volume of 8 cubic foot, we calculate by rule 3:

1cubic foot..............100 pounds

8 cubic foot.............x pounds

We will need 800 pounds of sand to fill the sandbox, then we can calculate by rule 3 the number of bags needed and next the total cost of them:

50 pounds.......1bag

800 pounds.....x bags

To calculate the cost:

1 bag ..................$3.50

16 bags.................$x

To completely fill the sandbox will cost $56

if you are looking for the unit rate then the answer would be 9 because unit rate is distance divided by time.

step-by-step explanation: