Addition and Subtraction of Integers

A dealer has $₹ 2,48,500$. He places an order for purchasing $50$ coolers at $₹ 4500$ each. How much money will remain with him after the purchase?

Imagine that you are a fighter pilot flying a jet aircraft at an altitude of $20000$ feet. You lower the aircraft by $7000$ feet and then raise it by $5000$ feet. What is the net change in altitude? Also find the altitude after the two changes.

An aeroplane is flying at a height of $5000 \mathrm{m}$above the sea level. A diver is swimming exactly below the aeroplane at a depth of $20 \mathrm{m}$ below the sea level, as shown in the figure. Later, he rises by $8 \mathrm{m}$ before diving down to $10 \mathrm{m}$. His new position is also exactly below the aeroplane. The vertical distance between the aeroplane and the new position of the diver is $5020 \mathrm{m}$.

Find the distance between the points  $-3$ and $-2$ using the number line.

Here is a list of number: $4, 7, 18, 28, 12, 23, 27$. Find the sum of two numbers that have a difference of $4$.

In the following figure, sum of the numbers at the vertices is written at the centre. What will come in the box?

Find the sum of $-4$ and $-6$.

Find the sum of $27$ and $-13$.

Subtract $3$ from $9$.

Find the sum of $-3$ and $-5$.

Find the sum of $13$ and $27$.