



 
Hi Jules, Suppose that there are B boys at the party and G girls, thus when you get to part b) you know that
For part a) you know that the number of boys dancing is 2/3 B and the number of girls dancing is 3/4 G. But the number of boys dancing is equal to the number of girls dancing so
or
Thus B/G = 9/8 of said as a ratio
I hope this helps,  


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