X = 13
( x + 4) / 51 = (2x - 7) / 57
585 = 45x
585/45 = 45x/45
x = 13
So 15/3 = 5 then
vinegar = 5x2 = 10 cups
water = 5x1 = 5 cups
Its 8:2/3, we can write it as

Now we can back to 12:1 - its the result
Answer:
452.39 feet
Step-by-step explanation:
the area of a circle is A=r^2π
the radius is 12 feet and lets us 3.14 for pi
A=12^2(3.14)
A=144(3.14)
A=452.39