Question

The cost of $18$ books is $Rs153$
What is the cost of $45books$?

Answer 1

Cost of $18$ books $=Rs.153\left(\text{Given}\right)$

$\Rightarrow$ Cost of $1$ book $=Rs.\frac{153}{18}$

$\therefore$ Cost of $45$ books $=\frac{153}{18}\times 45=Rs.382.5$