Question

The cost of $2$ pens is $₹90$ . What is the cost of $7$ such pens?

Answer 1

Since, the cost of $2$ pens = $₹90$

So, the cost of $1$ pens = $\frac{₹90}{2}=₹45$

So, the cost of $7$ pens = $7\times ₹45=₹315$

Hence, the cost of $7$ pens is $₹315$.