What will be the inverse ratio of $17: 19$?

The ratio of the ages of the father and mother was $11: 10$ when their son was born. The ratio of the ages of the father and mother will be $19: 18$ when the son is twice his present age. What is the ratio of the present ages of the father and mother?

An amount of $Rs. 735$ was divided between $A, B$ and $C$. If each of them had received $Rs. 25$ less,their shares would have been in the ratio of $1:3:2$. The money received by $C$ was

What will be $32 \%$ of $(\frac{3}{8})^{th}$ of $1000$?

If $6 A = 11 B = 7 C$,find $A : B : C$.

The ratio of the present age of Manoj to that of Wasim is $3:11$. Wasim is $12 \text{ yr}$ younger than Rehana. Rehana's age after $7 \text{ yr}$ will be $85 \text{ yr}$. What is the present age (in $\text{yr}$) of Manoj's father,who is $25 \text{ yr}$ older than Manoj?