Arithmetic problem: What is the capacity of each Breaker"?

[Penguin1]

Need help with this
I have 6 beaker of oil and 12 breaker of water, the total amount combined are 66 litres .
What is the capacity of each Breaker"?

 

[MarkFL]

Without more information, we will get an infinite number of ordered pairs that will satisfy the problem. I am assuming that the beakers containing oil all have the same capacity, and the beakers containing water all have the same capacity...and if we let $O$ be the capacity of the beakers containing oil, and $W$ be the capacity of the beakers containing water, we may state:

$$6O+12W=66$$

Divide through by 6:

$$O+2W=11$$

Even if we restrict ourselves to the positive integers, we have numerous solutions:

$$(O,W)=(1,5),\,(3,4),\,(5,3),\,(7,2),\,(9,1)$$