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

Find the third proportional to the numbers $4$ and $42$.

The ratio of money with Anju and Sanju is $4:5$ and that with Sanju and Manju is $5:6$. If Anju has $₹280$,then the amount of money (in $₹$) Manju has is:

The sum of the present ages of a father and his son is $90$ years. $10$ years ago,the ratio of their ages was $5:2$. The present age of the father is (in years):

Three numbers are in the ratio $2:3:4$. If the sum of their squares is $1856$,then the numbers are:

$A$ sum of money is divided among $C, A$ and $B$ in the ratio of $4:5:6$ and another sum of money is divided between $M$ and $N$ equally. If $B$ got $2000$ more than $M$,then how much does $C$ get (in $Rs.$)?