Question

If $5$notebooks cost $₹105$, then find the cost of $7$ notebooks.

Answer 1

Finding the cost of $7$ notebooks.

Given, cost of $5$notebooks $=$ $₹105$

Cost of $1$notebook $=\frac{₹105}{5}$

$=₹21$

So, the cost of $7$notebook $=₹21\times 7$

$=₹147$

Hence, the cost of $7$ notebook is $₹147$.