Question 889987
If there are 50 males, then how many females must there be in order for the ratio of males to females to be 3 to 4? 
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That is certainly one way to do it, but a similar way
{{{50/f}}} = {{{3/4}}}
Cross multiply
3f = 4*50
f = 200/3
f = 66.67 ~ 67