Find the compound ratio of $2:7$,$5:3$,and $4:7$.

Ram got twice as many marks in English as in Science. His total marks in English,Science,and Mathematics are $180$. If the ratio of his marks in English and Mathematics is $2:3$,what are his marks in Science?

In an army selection process,the ratio of selected to unselected candidates was $5:1$. If $100$ fewer candidates had applied and $20$ fewer had been selected,the ratio of selected to unselected candidates would have been $6:1$. How many candidates had applied for the process?

The number of students in three classes are in the ratio $2:3:4$. If $12$ students are increased in each class,this ratio changes to $8:11:14$. The total number of students in the three classes in the beginning was:

If $\frac{625}{x} = \frac{x}{1156}$,then what will be the value of $x$?

Three brothers divided ₹ $1620$ among themselves in such a way that the share of the second brother is equal to $\frac{5}{13}$ of the share of the other two combined. What is the share of the second brother?