Direct and Inverse Proportions

If $x$ and $y$ are in direct proportion, and the value of $x$ is doubled, what happens to the value of $y$?

A $100$ gram serving of a snack contains $12$ grams of fat. How many grams of fat are in a $250$ gram pack of the same snack?

If $\frac{x}{y} = \frac{9}{4}$ and $y = 16$, what is the value of $x$?

2 men build a fence in 6 days. How many days will 3 men take to build the same fence?

16 workers can complete a project in 10 days. How many days will 20 workers take to complete it?

A car travels at 50 km/h for 2 hours to cover a distance. What speed must it maintain to cover the same distance in 1 hour?

If $12$ men can complete a piece of work in $20$ days, how many days will $15$ men take to do the same work?

If $x$ and $y$ are in direct proportion and $x = 6$ when $y = 10$, find $y$ when $x = 15$.

If $10$ toys cost ₹$450$, how much will $15$ toys cost?