Question

Fifteen post cards cost Rs 2.25. What will be the cost of 36 post cards? How many postcards can we buy in Rs 45?

Answer 1

Cost of 15 postcards = Rs. 2.25

Cost of 1 postcard = Rs. $\frac{2.25}{15}$

Cost of 36 postcards = $\frac{2.25}{15}\times 36=\frac{225}{15\times 100}\times 36=\mathrm{Rs}.5.40$

Number of postcards purchased in Rs. 1 = $\frac{15}{2.25}$

Number of postcards purchased in Rs. 45 = $\frac{15}{2.25}\times 45=\frac{15\times 100}{225}\times 45=300$