Winter Intersession

15 or Unknown, depending on whether 1 duck is half of two ducks or not.

...

The single chicken is clearly defined.

5 + 2x + 2x = 9
Therefore x = 1

>25?

nevermind. 15
realized it was one chicken

I'm taking 5 classes

Anyone that didn't say 15, is a bloody brainlet

first row: x + x + x = 30; x = 10
second row: x + y + y = 20; 10 = 2y = 20; y = 5
third row: y + z + z = 9; 5 + 2z = 9; z = 2
final row: y + 0.5z * x; 5 + 1*10; 15

...

The 2 ducks together indicate multiplication brainlets