Please help ASAP There are two identical glasses. One glass is 10/12 full. The other is 8/15 full. Water is poured from one glass to the other so that one of them is now full. What fraction of the other glass is filled ?

You add them together and subtract 1 because the total amount stays the same throughout the entire problem and you have to find the amount of water in the glass that is not full when the other glass is full. 10/12 + 8/15 = 50/60 + 32/60 = 82/60. 82/60 - 60/60 = 22/60, which simplifies to 11/30.

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.