Question: Can you give me some step-by-step instructions for this math problem: A class composed of 12 girls and 10 boys was sent to the library for their reading class. Their teacher found out that only 5/6 of the girls and 4/5 of the boys are reading. How many students are not reading?
Answer: 
There are 12 x 5/6 = 10 girls who are reading.
So, 12 - 10 = 2 girls are not reading.
There are 10 x 4/5 = 8 boys who are reading.
So, 10 - 8 = 2 boys are not reading.
Thus, there are a total of 2 girls + 2 boys = 4 students who are not reading.