Difference between revisions of "2009 AMC 10B Problems/Problem 5"
m (→Problem) |
|||
| Line 16: | Line 16: | ||
{{AMC10 box|year=2009|ab=B|num-b=4|num-a=6}} | {{AMC10 box|year=2009|ab=B|num-b=4|num-a=6}} | ||
{{AMC12 box|year=2009|ab=B|num-b=2|num-a=4}} | {{AMC12 box|year=2009|ab=B|num-b=2|num-a=4}} | ||
| + | {{MAA Notice}} | ||
Revision as of 11:52, 4 July 2013
- The following problem is from both the 2009 AMC 10B #5 and 2009 AMC 12B #3, so both problems redirect to this page.
Problem
Twenty percent off 60 is one-third more than what number?
Solution
Twenty percent less than 60 is 
. One-third more than a number n is 
. Therefore 
and the number is 
. The answer is 
.
See also
| 2009 AMC 10B (Problems • Answer Key • Resources) | ||
| Preceded by Problem 4 |
Followed by Problem 6 | |
| 1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 • 16 • 17 • 18 • 19 • 20 • 21 • 22 • 23 • 24 • 25 | ||
| All AMC 10 Problems and Solutions | ||
| 2009 AMC 12B (Problems • Answer Key • Resources) | |
| Preceded by Problem 2 |
Followed by Problem 4 |
| 1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 • 16 • 17 • 18 • 19 • 20 • 21 • 22 • 23 • 24 • 25 | |
| All AMC 12 Problems and Solutions | |
The problems on this page are copyrighted by the Mathematical Association of America's American Mathematics Competitions. 
