Problem: Two is 10%10 \%10% of xxx and 20%20 \%20% of yyy. What is x−y?x-y?x−y?
Answer Choices:
A. 111 B. 222 C. 555 D. 101010 E. 202020 Solution:
It is given that 0.1x=20.1 x=20.1x=2 and 0.2y=20.2 y=20.2y=2, so x=20x=20x=20 and y=10y=10y=10. Thus x−y=10x-y=\boxed{10}x−y=10.
The problems on this page are the property of the MAA's American Mathematics Competitions