# Uneven Ratio

Algebra Level pending

At once, the ratio of male and female members on Brilliant.org was 10:1. $$n$$ boys joined to make the ratio 11:1, then $$m$$ girls joined to make the ratio 9:1. $$\frac {m}{n}$$ could be written as $$\frac {a}{b}$$, where a and b are coprime integers. What is $$ab$$?

P.S. I made this question up, and the data in the question may not be correct.

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