Difference between revisions of "2011 AMC 10A Problems/Problem 5"
m (→Solution) |
|||
| Line 10: | Line 10: | ||
== See Also == | == See Also == | ||
{{AMC10 box|year=2011|ab=A|num-b=4|num-a=6}} | {{AMC10 box|year=2011|ab=A|num-b=4|num-a=6}} | ||
| + | {{MAA Notice}} | ||
Revision as of 12:00, 4 July 2013
Problem 5
At an elementary school, the students in third grade, fourth grade, and fifth grade run an average of 
, 
, and 
minutes per day, respectively. There are twice as many third graders as fourth graders, and twice as many fourth graders as fifth graders. What is the average number of minutes run per day by these students?
Solution
Let there be 
fifth graders. It follows that there are 
fourth graders and 
third graders.
We have 
.
See Also
| 2011 AMC 10A (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 | ||
The problems on this page are copyrighted by the Mathematical Association of America's American Mathematics Competitions. 
