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

If $3A = 4B = 5C$,then $A : B : C$ is

What will be the duplicate ratio of $2: 7$?

The railway fares of air-conditioned sleeper class and ordinary sleeper class are in the ratio $4:1$. The number of passengers who travelled by air-conditioned sleeper and ordinary sleeper classes were in the ratio $3:25$. If the total collection was ₹ $37,000$,how much did air-conditioned sleeper passengers pay (in ₹) (in $,000$)?

$94$ is divided into two parts in such a way that the fifth part of the first and the eighth part of the second are in the ratio $3:4$. The first part is:

$A$ man spends $Rs. 2310$ on an average during the first $8$ months from his income. During the next $4$ months,he spends $Rs. 1800$ on an average from his income,but he had taken a loan of $Rs. 1680$ apart from his income to meet his expenses. If he spent all that he had,what is the ratio of his average income to his average expenditure?