$47 \times 251 - 13343 + 1547 = ?$

Two baskets together have $640$ oranges. If $\frac{1}{5}$ of the oranges in the first basket are taken to the second basket,the number of oranges in both baskets becomes equal. The number of oranges in the first basket is:

$42 \%$ of a number is $357$. What is $63 \%$ of that number?

If $64$ is subtracted from a number,then it reduces to $36 \%$ of itself. What is $\frac{4}{5}$ of that number?

$A$ fraction is greater than its reciprocal by $\frac{9}{20}$. What is the fraction?

The sum of squares of two numbers is $68$ and the square of their difference is $36$. The product of the two numbers is