The following are rectangles of equal breadth on graph paper. Find the area for each rectangle and fill the table.

Rectangle	$1$	$2$	$3$	$4$	$5$
Length ($\mathrm{cm}$)
Area (${\mathrm{cm}}^2$)

Is the area directly proportional to length?

If $p$ persons working $p$ hours a day for each of $p$ days produce $p$ units of work, then the units of the work produced by $q$ persons working $q$ hours a day for each $q$ day is:

The cost of milk per litre is $₹15$. Draw the graph for the relation between the quantity and cost. Hence find the proportionality constant.

A device can write $100$ digits in $1$ minute. It starts writing natural numbers. The device is stopped after running it for half an hour. It is found that the last number it was writing, is incomplete. The number is

The cost of milk per litre is $₹15$. Draw the graph for the relation between the quantity and cost. Hence find the cost of $3$ litres of milk..

Using properties of proportion find $x:y$, given:

$\frac{x^2+2x}{2x+4}=\frac{y^2+3y}{3y+9}$