Question

Some post cards costing 25 paise each and Inland letters costing Rs. 2 each were purchased for Rs. 53. Total number of post cards and Inland letters purchased was 44. If the number of post cards and Inland letters is interchanged, how much less would be the amount?​

Answer 1

Answer:

Rs 42

Step-by-step explanation:

Let there be x postcards and y inlands.

       x + y = 60

   30x + 150y = 6600

Solving these equations,

      30x + 30y = 1800

(-)   30x + 150y = 6600

             -120y = 4800

                    y = 40

                    x = 20

On interchanging inland and postcard,

                    x = 40 and y= 20

                     = 40 x 0.3 + 20 x 1.5

                     = Rs 42