Chris needs to fill his son's sandbox that is 5 feet by 7 feet. He wants to buy sand bags to fill the sand 2 feet deep. He compares the prices found for sand at two different stores,
Store X: 30 lb bag for $3
Store Y: 32 lb bag for $4
Part A
What is the unit rate that Store x is selling for?
Ibs/dollar
What is the unit rate that Store Y is selling for?
Ibs/dollar
Part B
Which store is offering the better price?
Part
Chris finds that it takes 100 pounds of sand to fill 1 cubic foot. Using the better priced store, compute how much it will cost him to
purchase enough sand to fill the sandbox. Use the volume formula, V = 1 x W xh, to determine your answer.
$
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step-by-step explanation:

12: 00 p.m. to 7: 00 p.m. is a total of 7 hours.

4: 00 p.m. to 7: 00 p.m. is a total of 3 hours.

this means that from 4: 00 p.m to 7: 00 p.m. this represents 3/7 of what was lost from 12: 00 p.m. to 7: 00 p.m.

after knowing this, after doing 11,600 - 6,800 = 4,800

4,800 represents 3/7 of what was lost for 7 hours.

we then divide 4,800 by 3 which gets 1,600.

because we know that 1,600 represents 1/7 of how much water was lost, we just have to multiply by 7, which gets 11,200.   after adding 11,200 to how much water was left at 7: 00 p.m. which was 6,800. 11,200 + 6,800 = 18,000

this means that the pool originally had 18,000 gallons in the pool.

you can also check your work by doing 18,000 - 4(1600), which becomes           1800 - 6400 which gets you 11,600.