Mark and Ann together were allocated n boxes of cookies to sell for a club project. Mark sold 9 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?  Choose the correct choice from the following choices
A) 9
B) 10
C) 11
D) 12
E) 13
if n =10   mark sold 1 box   and Ann sold 8 boxes   total 9 &lt; 10   Answer:10
<result>B</result>
Mark and Ann together were allocated n boxes of cookies to sell for a club project. Mark sold 9 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?