Question : If $A:B=7:9$ and $B:C =3:5$, then $A:B:C$ is equal to:

Option 1: $7:9:5$

Option 2: $21:35:45$

Option 3: $7:9:15$

Option 4: $7:3:15$

Question : If $\left(3 y+\frac{3}{y}\right)=8$, then find the value of $\left(y^2+\frac{1}{y^2}\right)$.

Option 1: $5\frac{1}{9}$

Option 2: $4\frac{5}{6}$

Option 3: $7\frac{1}{9}$

Option 4: $9\frac{1}{9}$

Question : If $\sqrt{a}=3b$, then $\frac{a}{b^2}$ is equal to:

Option 1: $\frac{1}{6}$

Option 2: $6$

Option 3: $\frac{1}{9}$

Option 4: $9$

Question : If 45% of a certain number is equal to $\frac{6}{5}$th of another number, what is the ratio between the numbers?

Option 1: 9 : 11

Option 2: 8 : 3

Option 3: 1 : 7

Option 4: 7 : 4

Question : If $\operatorname{cosec} A+\cot A=7$, then $\operatorname{cosec} A$ is equal to:

Option 1: $\frac{11}{7}$

Option 2: $\frac{16}{7}$

Option 3: $\frac{25}{7}$

Option 4: $\frac{19}{7}$