What is the value of $68 \%$ of two-fifths of $550$?

$A$ and $B$ are two alloys of gold and copper prepared by mixing metals in the ratio $7:2$ and $7:11$ respectively. If equal quantities of the alloys are melted to form a third alloy $C$,the ratio of gold and copper in $C$ will be

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:

If $(x+y):(x-y)=11:1$,find the value of $\frac{(5x+3y)}{(x-2y)}$.

The prices of a refrigerator and a television set are in the ratio $5:3$. If the refrigerator costs $Rs. 5500$ more than the television set,then the price of the refrigerator is (in $Rs.$):

The value of $k$ that must be added to $7, 16, 43,$ and $79$ so that they are in proportion is