Difference between revisions of "1997 PMWC Problems/Problem I7"
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== Problem == | == Problem == | ||
− | 40% of girls and 50% of boys in a class got 'A'. If there are only 12 students in the class got 'A's and the ratio of boys and girls in the class is 4:5, how many students are there in the class? | + | 40% of girls and 50% of boys in a class got an 'A'. If there are only 12 students in the class who got 'A's and the ratio of boys and girls in the class is 4:5, how many students are there in the class? |
== Solution == | == Solution == |
Revision as of 14:20, 9 October 2007
Problem
40% of girls and 50% of boys in a class got an 'A'. If there are only 12 students in the class who got 'A's and the ratio of boys and girls in the class is 4:5, how many students are there in the class?
Solution
Substituting, . So there are 12 boys, and students in the class.
See also
1997 PMWC (Problems) | ||
Preceded by Problem I6 |
Followed by Problem I8 | |
I: 1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 T: 1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 |