Answer:
Tank which is capable of holding 1 can fill each one of the tanks an exact number of time.
Step-by-step explanation:
Three tanks are capable of holding
To find which tank can be used to fill each one of them an exact number of time, find 

Therefore,

So, tank which is capable of holding 1 can fill each one of the tanks an exact number of time.
The answer is 18 because you keep 6/1 Chang division to multiplication then flip 1/3 to 3/1 then solve it which again the answer is 18 ;)
You can go full 2π rotate around counterclockwise so the angle wouldn't be negative.
So -π/2 + 2π = -π/2 + 4π/2 = 3π/2
So (4, 3π/2) is the same point as (4, -π/2)
B: 2 and 1/6.
Tricky one if you rush through, its meant to SEEM complicated, like a lot of math questions.