Mark and Ann together were allocated n boxes of cookies to sell for a club project. Mark sold 8 boxes less than n and Ann sold 2 boxes less than n. If Mark and Ann have each sold at least one box of cookies, but together they have sold less than n boxes, what is the value of n?
Choices
A) 5
B) 6
C) 7
D) 8
E) 9

Rationale: "if n = 9 mark sold 1 box and ann sold 7 boxes total 8 < 9 answer : e"
Answer: E