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

In a class there are $z$ students. Out of them $x$ are boys. What part of the class is composed of girls?

₹ $1980$ is divided among $A$,$B$,and $C$ such that half of $A$'s part,one-third of $B$'s part,and one-sixth of $C$'s part are equal. What is $B$'s part (in ₹)?

There are three sections $A, B$ and $C$ in a school of class $I$. The ratio of students in sections $A$ and $B$ is $3:5$ and that in $B$ and $C$ is $4:7$. If the total number of students in the class is $201$,then the number of students in section $A$ is:

The incomes of Gupta and Verma are in the ratio $9: 4$ and their expenditures are in the ratio $7: 3$. If each saves ₹ $2000$,then Gupta's expenditure is (in ₹):

The sum of the present ages of a father and his son is $90$ years. $10$ years ago,the ratio of their ages was $5:2$. The present age of the father is (in years):