Find a fourth proportional to the numbers $60, 48, 30$.

If $A : B : C = 2 : 3 : 4,$ then $\frac{A}{B} : \frac{B}{C} : \frac{C}{A}$ is equal to

The difference between the ages of Meena and Seema is $3 \ yr$ and the ratio between their ages is $7: 8$. What is the sum of their ages (in $yr$)?

Calculate the fourth proportional to the numbers $286, 78, 1342$.

₹ $1980$ 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 ₹)?

Find the fraction which bears the same ratio to $\frac{1}{27}$ that $\frac{3}{7}$ does to $\frac{5}{9}$.