5

Spaceship Landing Zone!

A secretary typed 6 letters, each of which had either 1 or 2 pages. If the secretary typed 10 pages in all, how many of the letters had 2 pages?

A) 1
B) 2
C) 3
D) 4
E) 5


Please include an explanation along with the answer. The one I have here doesn't seem to work for me.