Difference between revisions of "1985 AJHSME Problems/Problem 16"
5849206328x (talk | contribs) (New page: ==Problem== The ratio of boys to girls in Mr. Brown's math class is <math>2:3</math>. If there are <math>30</math> students in the class, how many more girls than boys are in the class? ...) |
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==Problem== | ==Problem== | ||
| − | The ratio of boys to girls in Mr. Brown's math class is <math>2:3</math>. If there are <math>30</math> students in the class, how many more girls than boys are in the class? | + | The [[ratio]] of boys to girls in Mr. Brown's math class is <math>2:3</math>. If there are <math>30</math> students in the class, how many more girls than boys are in the class? |
<math>\text{(A)}\ 1 \qquad \text{(B)}\ 3 \qquad \text{(C)}\ 5 \qquad \text{(D)}\ 6 \qquad \text{(E)}\ 10</math> | <math>\text{(A)}\ 1 \qquad \text{(B)}\ 3 \qquad \text{(C)}\ 5 \qquad \text{(D)}\ 6 \qquad \text{(E)}\ 10</math> | ||
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Let the number of boys be <math>2x</math>, it follows that the number of girls is <math>3x</math>. These two values add up to <math>30</math> students, so <cmath>2x+3x=5x=30\Rightarrow x=6</cmath> | Let the number of boys be <math>2x</math>, it follows that the number of girls is <math>3x</math>. These two values add up to <math>30</math> students, so <cmath>2x+3x=5x=30\Rightarrow x=6</cmath> | ||
| − | The difference between the number of girls and the number of boys is <math>3x-2x=x</math>, which is <math>6</math>, so <math>\boxed{\text{D}}</math> | + | The [[subtraction|difference]] between the number of girls and the number of boys is <math>3x-2x=x</math>, which is <math>6</math>, so <math>\boxed{\text{D}}</math> |
==See Also== | ==See Also== | ||
| − | [[ | + | {{AJHSME box|year=1985|num-b=15|num-a=17}} |
| + | [[Category:Introductory Algebra Problems]] | ||
Revision as of 09:25, 16 May 2009
Problem
The ratio of boys to girls in Mr. Brown's math class is 
. If there are 
students in the class, how many more girls than boys are in the class?
Solution
Let the number of boys be 
, it follows that the number of girls is 
. These two values add up to students, so ![\[2x+3x=5x=30\Rightarrow x=6\]](http://latex.artofproblemsolving.com/7/c/5/7c5cba1c4d3b8b83efd4057cc728b08d7e2630b1.png)
The difference between the number of girls and the number of boys is 
, which is 
, so 
See Also
| 1985 AJHSME (Problems • Answer Key • Resources) | ||
| Preceded by Problem 15 |
Followed by Problem 17 | |
| 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 | ||
