Difference between revisions of "2011 AMC 12A Problems/Problem 4"
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== Problem == | == Problem == | ||
| − | At an elementary school, the students in third grade, fourth grade, and fifth grade run an average of 12, 15, and 10 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? | + | At an elementary school, the students in third grade, fourth grade, and fifth grade run an average of <math>12</math>, <math>15</math>, and <math>10</math> 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? |
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| + | <math> | ||
| + | \textbf{(A)}\ 12 \qquad | ||
| + | \textbf{(B)}\ \frac{37}{3} \qquad | ||
| + | \textbf{(C)}\ \frac{88}{7} \qquad | ||
| + | \textbf{(D)}\ 13 \qquad | ||
| + | \textbf{(E)}\ 14 </math> | ||
== Solution == | == Solution == | ||
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== See also == | == See also == | ||
{{AMC12 box|year=2011|num-b=3|num-a=5|ab=A}} | {{AMC12 box|year=2011|num-b=3|num-a=5|ab=A}} | ||
Revision as of 01:31, 10 February 2011
Problem
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
See also
| 2011 AMC 12A (Problems • Answer Key • Resources) | |
| Preceded by Problem 3 |
Followed by Problem 5 |
| 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 | |
