Question

Praveen bought one pencil and one eraser of rupees 7.50 . We gave rupees 10 to the shopkeeper . the shopkeeper gave back coins of 50 paisa . how many coins did he get?​

Answer 1

Pravin bought one pencil, eraser = Rupees 7.50

He gave total rupees to shopkeeper = 10

To find the total money he gave back, we have to subtract.

==> 10 - 7.50

==> 2.50

So, Pravin got back 2.50 Rupees back from the shopkeeper.

Answer 2

Given,

The total cost of one pencil and one eraser$\[ = 7.50\]$

To find,

The number of coins returned by the shopkeeper.

Solution,

Know that in one rupee there are two fifty paisa coins.

So, the amount returned by the shopkeeper

$\[\begin{array}{l} = 10 - 7.50\\ = 2.50\end{array}\]$

Therefore, the number of fifty paisa coins are

$\[\begin{array}{l} \Rightarrow 2.50\\ \Rightarrow 1 + 1 + 0.50\\ \Rightarrow \left( {0.50 + 0.50} \right) + \left( {0.50 + 0.50} \right) + 0.50\\ \Rightarrow 5{\rm{coins}}\end{array}\]$

Hence, the number of coins are $\[5.\]$