the ratio of girls to boys at school is 7:4. if there are currently 189 girls at the school, then how many additional boys would be needed so that the resulting ratio of girls to boys is 3:2? Show answer in two different ways...

Question

the ratio of girls to boys at school is 7:4.  if there are currently 189 girls at the school, then how many additional boys would be needed so that the resulting ratio of girls to boys is 3:2?  Show answer in two different ways...

anonymous · Answer

7x+4x+189
11x=189
x=189/11
x=17.2
7x/4x=120/69
3x+2x=189
5x=189
x=189/5
x=37.8
3x/2x=113/75.6

anonymous · Answer

please explain...