<em>The answer to your problem is:</em>
x = 1/6
Answer:
16 gallons
Step-by-step explanation:
3/8*x+6=3/4*x
3x/8+6=6x/8
6=3x/8
2=x/8
16=x

is the same thing as

and

Therefore, the first option is correct.
To find the volume of something, you do the area times the height. In this case you already know the volume so you solve it like this:
(x represents the height since you don't know the value)
1440= 144 * x
1440 = 144x
1440/144= 144x/144
10 = x
Your height is 10:)