In a seventh grade class, there are 5 boys for every 3 girls. There are 12 more girls than boys. How many girls are in the class?
2007-03-28 13:09:01 · 6 answers · asked by amandablake3194 2 in Science & Mathematics ➔ Mathematics
5/3 = g+12/g
3g+36=5g
36=2g
18=g, so b=30
2007-03-28 13:13:21 · answer #1 · answered by leo 6 · 1⤊ 1⤋
The question is wrong. If there are 5 boys for every 3 girls, then there can't be more girls than boys in the class.
Here's how the solution works if there are actually 5 girls for every 3 boys.
Let x be the number of girls in the class.
Then (x-12) is the number of boys.
Since there are 5 girls for every 3 boys, we know that:
x/(x-12) = 5/3
Cross-multiplying, we get:
3x = 5*(x-12)
3x = 5x -60
60 = 5x - 3x
60 = 2x
30 = x
Hence, there are 30 girls and 18 boys.
Assuming, of course, that there were 5 girls for every 3 boys.
2007-03-28 20:16:18 · answer #2 · answered by Bramblyspam 7 · 0⤊ 0⤋
That doesn't make sense. If there are 5 boys for every 3 girls, there should be more boys than girls, not the other way around. Check your wording. Have you made a mistake typing the question in?
Edit: P.S. See the answers above me have the number of boys as more than the number of girls. But you said "there are 12 more girls than boys." So check your wording.
2007-03-28 20:13:27 · answer #3 · answered by dac2chari 3 · 2⤊ 0⤋
The question is impossible to answer. If there 5 boys for every 3 girls then there must be more boys than girls in the class. There cannot be mor girls than boys.
2007-03-28 20:15:36 · answer #4 · answered by ironduke8159 7 · 0⤊ 0⤋
30 boys 18 girls
2007-03-28 20:12:23 · answer #5 · answered by bob b 3 · 0⤊ 1⤋
18 boys and 30 girls is the correct answer..........
2007-03-28 20:18:57 · answer #6 · answered by BeeStingoRay.<':)))>X 1 · 0⤊ 0⤋