Let's call this unknown number, x.
So then we can put together the equation using the information from the question:
Then we start by distributing this 10 to both the and the 6:
Then we subtract 60 on both sides:
Then we divide both sides by 5 to solve for x:
or
Answer:
Option A 12 is the answer
According to my examination I have confirmed that I do NOT repeat do NOT know this. Good luck!