选择题
2009 AMC 8 Problem 11: Pencil Purchases
The Amaco Middle School bookstore sells pencils costing a whole number of cents. Some seventh graders each bought a pencil, paying a total of 1.43 dollars. Some of the 30 sixth graders each bought a pencil, and they paid a total of 1.95 dollars. How many more sixth graders than seventh graders bought a pencil?
A.
1
B.
2
C.
3
D.
4
E.
5