Problem:
The sum 271​+321​+5191​ is between
Answer Choices:
A. 10 and 1021​
B. 1021​ and 11
C. 11 and 1121​
D. 1121​ and 12
E. 12 and 1221​
Solution:
The desired sum can be rewritten as 2+3+5+71​+21​+191​ which equals 10+21​+(a number less than 21​) so B is correct.
Answer: B​.
The problems on this page are the property of the MAA's American Mathematics Competitions