$12$ workers can construct a wall in $15$ days. In how many days can $18$ wrokers construct a similar wall? What will you do if you see a child working on a construction site? Is child labour legal?

In a year, Seema earns $₹1,50,000$ and saves $₹50,000$. Find the simplest ratio of money that Seema earns to the money she saves.

In a year, Seema earns $₹150000$ and saves $₹50000$. Find the ratio of money that she saves to the money she spends.

Determine if the following ratio form a proportion. Also, write the middle term and extreme term where the ratio form a proportion.

$25 \mathrm{cm}:1 \mathrm{m}$ and $₹40:₹160$.

Determine if the following ratio form a proportion. Also, write the middle term and extreme term where the ratio form a proportion.

$39$ litres$:65$ litres and $6$ bottles$:10$ bottles.

Determine if the following ratio form a proportion. Write Yes/No.

$2 \mathrm{kg}:80 \mathrm{kg}$ and $25 \mathrm{g}:625 \mathrm{g}$.

The middle terms term of the ratios that form a proportion $200 \mathrm{ml}:2.5 \mathrm{litres}$ and $₹4:₹50$ is $2.5$ litres $\times ₹$ _____