Question

If 15 postcards costs 7.50. What will be the cost of 36 such postcards ? Also find the number of postcards one can buy for 45.​

Answer 1

Answer:

Step-by-step explanation:

cost of 15 postcards=7.50

cost of 1 postcard=7.50/15

=75/150

=0.5

cost of 36 postcards=36*0.5=18

number of postcards for 45 rupees=45/0.5

=450/5

=90

Answer 2

Answer:

15 Post cards = Rs. 7.50

1 Post card = 2.25/15 = 0.5

Hence, 36 Post cards = 0.5 × 36 = Rs 18

Let the no. of post cards bought in 45 rs be x

Therefore, 45/x = 0.5

x = 45/0.5 = 90