Difference between revisions of "2007 AMC 12B Problems/Problem 10"
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| + | {{AMC12 box|year=2007|ab=B|num-b=9|num-a=11}} | ||
Revision as of 01:20, 10 February 2009
Problem
Some boys and girls are having a car wash to raise money for a class trip to China. Initially 
% of the group are girls. Shortly thereafter two girls leave and two boys arrive, and then 
% of the group are girls. How many girls were initially in the group?
Solution
First, determine the total number of people in the group.
Now find the original number of girls:
So, there are 8 girls, 
See Also
| 2007 AMC 12B (Problems • Answer Key • Resources) | |
| Preceded by Problem 9 |
Followed by Problem 11 |
| 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 | |
