$75 \%$ of $480 = x \times 15$. Find the value of $x$.

If $25 \%$ of a number is subtracted from a second number,the second number reduces to its five-sixths. What is the ratio of the first number to the second number?

Aditya's salary is $80\%$ of Amit's salary and $120\%$ of Rajiv's salary. What is Amit's salary if Rajiv's salary is $30,000$ (in $,000$)?

$60 \%$ of $264$ is the same as

$A$ student has to obtain $33 \%$ of the total marks to pass. He got $125$ marks and failed by $40$ marks. The maximum marks are

$125 \%$ of $320 + x \%$ of $125 = 440$. Find the value of $x$.