A taxi driver filled his car petrol tank with $40 \mathrm{litres}$ of petrol on Monday. The next day, he filled the tank with $50 \mathrm{litres}$ of petrol. If the petrol costs $₹44$ per $\mathrm{litre}$, how much total amount did he spend on petrol?

The weights of five students are shown below : 

Draw the bar graph for the above data.

How many tiles of measures $12 \mathrm{cm}$ by $5 \mathrm{cm}$ will be needed to fit in a rectangular region whose length and breadth are $100 \mathrm{cm}$ and $144 \mathrm{cm}$?

How many tiles of measures $12 \mathrm{cm}$ by $5 \mathrm{cm}$ will be needed to fit in a rectangular region whose length and breadth are $70 \mathrm{cm}$ and $36 \mathrm{cm}$?

Present age of father is $42$ years and that of his son is $14$ years. Find the ratio of:

Present age of father to the present age of son.

Present age of father is $42$ years and that of his son is $14$ years. Find the ratio of:

Age of father to the age of son, when son was $12$ years old.

Present age of father is $42$ years and that of his son is $14$ years. Find the ratio of:

Age of father after $10$ years to the age of son after $10$ years.

Present age of father is $42$ years and that of his son is $14$ years. Find the ratio of:

Age of father to the age of son when father was $30$ years old.