955
55 is closer to 100 than to 0
So we have to round up
So 955 would be rounded to 1000
So your answer would be

Ok so first, let's combine the like terms on the right side by adding them

Now we look at them put back together

Now you have to move all your y's to one side and numbers without a variable to the other. So, for this we're going to add 6y to 7y on the right so the left side cancels out.

On the other side we subtract 6 from 19

and now to get the answer for y we divide 13 by 13 to get your answer of 1 :)
48 cups of water
1. 4x4= 16 (number of cups in 1 gallon)
2. 16x3= 48 (cups in 1 gallon x the number of gallons she needs)
The answer is 43 hope this helps