How many numbers between 200 and 400 begin or end with 3 ?
A. 20
B. 60
C. 100
D. 110
E. 120
Between 200 and 299, there are ten numbers ending with 3 (203, 213, 223. . .). Now, what the test writers are hoping is that you will have become so fixated on adding up the numbers between 200 and 299 that end with a 3 that you will do the same thing with the numbers between 300 and 399 and get ten more for a total of 20. Don’t let yourself get into such a trance. Don’t forget that the question is asking about numbers that begin or end with a 3. How many numbers between 300 and 399 begin or end with a 3? All 100 of them! The total is not 20, but 110. The answer is (D).
source: majortests.com
