Have you ever come across an exam question that is way too hard for your grade?

A Reddit recently shared a photo of his younger brother's mathematics examination question and it has received over 10k comments on Reddit. 

The question is claimed to be from a Grade 5 (approximately 10 years old) student's examination in the US. However, it seems to be too tough for students of that age. 

Tell us your answer in the comment. Let's see who is not 10 years old yet. 

Answer at the bottom.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

Turn your phone upside down to see the answer.