If $a: b = 3: 5$ and $b: c = 4: 7,$ then $a: c$ is equal to

If $53 \%$ of a number is $358$ less than the square of $26$,what is the value of $\frac{3}{4}$ of $23 \%$ of that number?

The third proportional to $0.8$ and $0.2$ is

If $A : B = 7 : 9$ and $B : C = 8 : 11,$ find $A : B : C$.

$P$ varies inversely with the product of $Q$ and $R$. When $Q = 6$ and $R = 12$,$P = 75$. When $Q = 5$ and $R = 10$,what is the value of $P$?

The monthly salaries of $A, B$ and $C$ are in the ratio $2: 3: 5$. If $C$'s monthly salary is $Rs. 12000$ more than that of $A$,then $B$'s annual salary is (in $Rs.$):