10% OFF! What was the original price of a set of dishes whose sale price is $216?

240

Step-by-step explanation:

If we get 10% off, we still have to pay 100-10 = 90%

Let x be the original price

x *90% = 216

.90x = 216

Divide each side by .90

.90x/.90 = 216/.90

x =240

The original price is 240

  $240

Step-by-step explanation:

The sale price is 90% of the original price, so ...

  $216 = 0.90 × original price

  original price = $216/0.90 = $240

The original price of the set of dishes was $240.

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.