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

What should be subtracted from $15, 28, 20,$ and $38$ so that the remaining numbers are in proportion?

Two numbers are in the ratio $3:5$. If $9$ is subtracted from each,they are in the ratio $12:23$. Find the smaller number.

The fourth proportional to $5, 8, 15$ is

The ratio of wine and water in a drum is $3:1$. What part of the mixture is taken out and replaced with an equal amount of water so that the ratio of wine and water in the mixture becomes $1:1$?

At present,Anil is $1.5$ times Purvi's age. $8$ years hence,the respective ratio between Anil and Purvi's ages will be $25:18$. What is Purvi's present age (in years)?