If $10^{2y} = 25$,then what is the value of $10^{y}$?

$(7.5 \times 7.5 + 37.5 + 2.5 \times 2.5)$ is equal to

Evaluate $\frac{(2.39)^{2}-(1.61)^{2}}{2.39-1.61}$

If $x = \frac{a}{a-1}$ and $y = \frac{1}{a-1}$,then

If we multiply a fraction by itself and divide the product by its reciprocal,the fraction thus obtained is $18 \frac{26}{27}$. The fraction is

$(2 + \frac{3}{x}) \times (y + \frac{1}{2}) = \frac{31}{4}$,find the values of $x$ and $y$ if $x$ and $y$ are positive integers.