Linear Equations Questions

The sum of two numbers $x$ and $y$ (where $x>y$) is equal to four times their difference. Find the value of $\frac{5xy}{3(x^2-y^2)}$.

$57\%$ of Ranita's weekly income is equal to $76\%$ of Bhaskar's weekly income. If Ranita's weekly income is decreased by $₹400$ while Bhaskar's weekly income remains unchanged, the ratio of the weekly incomes of Ranita and Bhaskar becomes $6:5$ respectively. What is the weekly income of Bhaskar (in $₹$)?