In a bag,there are coins of $25 p$,$10 p$,and $5 p$ in the ratio of $2:3:4$. If there is $Rs. 50$ in all,how many $5 p$ coins are there?

If $10 \%$ of $x = 20 \%$ of $y,$ then $x : y$ is equal to

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:

Three numbers are in the ratio $5:6:7$. If the product of the numbers is $5670$,then the greatest number is:

$15$ litres of mixture contains $20 \%$ alcohol and the rest water. If $3$ litres of water be mixed with it,the percentage of alcohol in the new mixture would be:

An employer reduces the number of his employees in the ratio $9: 8$ and increases their wages in the ratio $14: 15$. If the original wage bill was ₹ $18,900$,find the ratio in which the wage bill is decreased.