If $x = {\log _3}5,\,\,\,y = {\log _{17}}25,$ which one of the following is correct

The set of real values of $x$ for which ${\log _{0.2}}{{x + 2} \over x} \le 1$ is

If ${\log _{10}}x + {\log _{10}}\,y = 2$ then the smallest possible value of $(x + y)$ is

Let $a=3 \sqrt{2}$ and $b=\frac{1}{5^{\frac{1}{6}} \sqrt{6}}$. If $x, y \in R$ are such that  $3 x+2 y=\log _a(18)^{\frac{5}{4}} \text { and }$  $2 x-y=\log _b(\sqrt{1080}),$  then $4 x+5 y$ is equal to. . . . 

If ${\log _{10}}3 = 0.477$, the number of digits in ${3^{40}}$ is

If ${\log _7}2 = m,$ then ${\log _{49}}28$ is equal to