Difference between revisions of "2013 AMC 12B Problems/Problem 5"
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==Solution== | ==Solution== | ||
The sum of the ages of the fifth graders is <math>33 * 11</math>, while the sum of the ages of the parents is <math>55 * 33</math>. Therefore, the total sum of all their ages must be <math>2178</math>, and given <math>33 + 55 = 88</math> people in total, their average age is <math>\frac{2178}{88} = \frac{99}{4} = \boxed{\textbf{(C)}\ 24.75}</math>. | The sum of the ages of the fifth graders is <math>33 * 11</math>, while the sum of the ages of the parents is <math>55 * 33</math>. Therefore, the total sum of all their ages must be <math>2178</math>, and given <math>33 + 55 = 88</math> people in total, their average age is <math>\frac{2178}{88} = \frac{99}{4} = \boxed{\textbf{(C)}\ 24.75}</math>. | ||
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+ | == See also == | ||
+ | {{AMC12 box|year=2013|ab=B|num-b=4|num-a=6}} |
Revision as of 18:03, 22 February 2013
Problem
The average age of fifth-graders is . The average age of of their parents is . What is the average age of all of these parents and fifth-graders?
Solution
The sum of the ages of the fifth graders is , while the sum of the ages of the parents is . Therefore, the total sum of all their ages must be , and given people in total, their average age is .
See also
2013 AMC 12B (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 12 Problems and Solutions |