Difference between revisions of "1985 AJHSME Problems/Problem 23"
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==Problem== | ==Problem== | ||
− | King Middle School has <math> | + | King Middle School has <math>600</math> students. Each student takes <math>5</math> classes a day. Each teacher teaches <math>4</math> classes. Each class has <math>30</math> students and <math>1</math> teacher. How many teachers are there at King Middle School? |
<math>\text{(A)}\ 30 \qquad \text{(B)}\ 32 \qquad \text{(C)}\ 40 \qquad \text{(D)}\ 45 \qquad \text{(E)}\ 50</math> | <math>\text{(A)}\ 30 \qquad \text{(B)}\ 32 \qquad \text{(C)}\ 40 \qquad \text{(D)}\ 45 \qquad \text{(E)}\ 50</math> | ||
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If each student has <math>5</math> classes, and there are <math>1200</math> students, then they have a total of <math>5\times 1200=6000</math> classes among them. | If each student has <math>5</math> classes, and there are <math>1200</math> students, then they have a total of <math>5\times 1200=6000</math> classes among them. | ||
− | Each class has <math>30</math> students, so there must be <math>\frac{6000}{30}=200</math> classes. Each class has <math>1</math> | + | Each class has <math>30</math> students, so there must be <math>\frac{6000}{30}=200</math> classes. Each class has <math>1</math> teacher, so the teachers have a total of <math>200</math> classes among them. |
− | Each teacher teaches <math>4</math> classes, so if there are <math>t</math> teachers, they have <math>4t</math> classes among them. This was found to be <math>200</math>, so <cmath>4t=200\Rightarrow t=50</cmath> | + | Each teacher teaches <math>4</math> classes, so if there are <math>t</math> teachers, they have <math>4t</math> classes among them. This was found to be <math>200</math>, so <cmath>4t=200\Rightarrow t=50</cmath> |
− | This is answer choice <math>\boxed{\text{ | + | This is answer choice <math>\boxed{\text{E}}</math> |
+ | |||
+ | ==Solution 2 (Similar to above solution) == | ||
+ | Each teacher teaches <math>4</math> classes and each class has <math>30</math> students, so each teacher teaches <math>120</math> students in one class. | ||
+ | |||
+ | So, to teach five classes, there has to be <math>5</math> teachers, but there is <math>1200</math> students, so multiply by <math>\frac{1200}{120}</math> which is <math>50</math>, or <math>\boxed{\textbf{(E)}\ 50}</math> | ||
==See Also== | ==See Also== | ||
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{{AJHSME box|year=1985|num-b=22|num-a=24}} | {{AJHSME box|year=1985|num-b=22|num-a=24}} | ||
[[Category:Introductory Algebra Problems]] | [[Category:Introductory Algebra Problems]] | ||
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+ | {{MAA Notice}} |
Latest revision as of 15:27, 15 October 2024
Problem
King Middle School has students. Each student takes classes a day. Each teacher teaches classes. Each class has students and teacher. How many teachers are there at King Middle School?
Solution
If each student has classes, and there are students, then they have a total of classes among them.
Each class has students, so there must be classes. Each class has teacher, so the teachers have a total of classes among them.
Each teacher teaches classes, so if there are teachers, they have classes among them. This was found to be , so
This is answer choice
Solution 2 (Similar to above solution)
Each teacher teaches classes and each class has students, so each teacher teaches students in one class.
So, to teach five classes, there has to be teachers, but there is students, so multiply by which is , or
See Also
1985 AJHSME (Problems • Answer Key • Resources) | ||
Preceded by Problem 22 |
Followed by Problem 24 | |
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 AJHSME/AMC 8 Problems and Solutions |
The problems on this page are copyrighted by the Mathematical Association of America's American Mathematics Competitions.