I am watching Lecture 3 of Yale's Financial Theory Lecture (by John). At about minute 50 he explains something along this line (with reference to log utility functions).
And simplifies down to: 0.75/Px(x)= 0.25/Py(y)
Given that Px(x)+Py(y)=Total Money
He concludes that "The total spent on x relative to 3/4 is equal to the total spent on y relative to 1/4" and therefore a consumer would spend 3/4 of their income on x and 1/4 on y.
How is he drawing that conclusion from the above equations?