[BykrBayb]

You’re kidding, right?
The unit was on subtraction.
There are 6 balloons of one color, and five balloons of another color. How many more balloons of the first color are there?
This is not subjective. It’s not open to interpretation. Words mean things, and math is an absolute science.
6 - 5 = 1. Always 1. Never 11.

[Eepsy]

The color part looks like it was added after grading the b/w handout. Initially it looks to have read “You have six balloons. You have five balloons. How many more balloons are there?”, to which “11” is a legitimate answer.

[MatD]

If you can see that the balloons are different color on a black and white copy then you are a better person that the rest of the population.

[William Tell]

BykrBayb said: "Never 11."

Sounds like a good way to find out whether a child is colorblind or not.