Properties of Logarithms

Q. Value of ${\log }_{5}625$ is

1. 2
2. 5
3. 4
4. 0

Q.

If $A=lo{g}_2\left(lo{g}_2\right(lo{g}_{4}256\left)\right)+2lo{g}_{\sqrt{2}}2$, then A is equal to

1. 5

2. 3

3. 2

4. 7

Q. If $\log x/2=\log y/3,$ find the value of $y^4/x^6.$