Math Problem

Date: 11/8/2016

I was in a classroom in which I know nobody. Teacher was talking about a math problem and asked if someone could solve it. No one raised their hands and the teacher called me up with confidence that I could solve the problem. I took it but not very sure. The problem was very weird and it got something look like two strings of number: 1234569 (7) and 78 (2). When I have not finished, someone from the class had already finished solving the problem with the meaning that: "it's so easy and they don't really need me to go up there to showcase" ;)