Find the number which,when subtracted from the terms of the ratio $12: 17$,makes it equal to the ratio $2: 3$.

The flight fare between two cities is increased in the ratio $9:11$. What is the increase (in ₹) in the fare,if the original fare was ₹ $18,000$?

The ratio of the number of boys and girls in a school of $720$ students is $7: 5$. How many more girls should be admitted to make the ratio $1: 1$?

₹ $900$ is divided among $A, B, C$; the division is such that $\frac{1}{2}$ of $A$'s money $= \frac{1}{3}$ of $B$'s money $= \frac{1}{4}$ of $C$'s money. Find the amount received by $A, B,$ and $C$.

Find the value of $x$ in the following proportion: $27: 72 :: x: 8$

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