Hi,

In a supermarket, Shakira bought 5 items from aisles 1 through 7, inclusive, and 7 items from aisles 4 through 10, inclusive. Which of the following could be the total number of items that Shakira bought?

I. 9

II. 10

III. 11

A. II only

B. I and II only

C. I and III only

D. II and III only

E. I, II and III

Given answer is E.

My thoughts: the number of items bought have to lie between 5 and 12 (5 + 7).

So a good guess would be E.

CollegeBoard's explanation is too winded. I don't think I'd come up with it in 60 seconds, let alone under 60 seconds.