Since the ratio is 3:4, and 12/4 is 3 than you do 3x3 and get 9 so the answer is 9:12 or 9 boys and 12 girls. To check your answer, you can do 3/4 (for 3:4) and that is 0.75. If you do that with 9:12 you also get 0.75.
The answer is x<9/2
hope it helps
Well if you want to turn an improper fraction to a mixed number you just divide the denominator by the numerator if that's what your asking
