Question

How Many Stamps?
• Rahul needs stamps of Rupees 25 for his parcel. He went to the post office. Only stamps of Re 1, Rs 2, Rs 5 and Rs 10 were there at that time. Using those stamps in how many different ways can he make Rs 25?

• Can you show five different ways? What is the heaviest parcel he can send using stamps of Rs 25?

Answer 1

The 5 different ways are given below:
(1)
Rahul can buy five stamps of Rs 5 each in order to buy stamps of Rs 25 for his parcel.
Cost of 1 stamp = Rs 5
Cost of 5 stamps = Rs 5 × 5
= Rs 25

(2)
Rahul can buy two stamps of Rs 10 each and one stamp of Rs 5 in order to buy stamps of Rs 25 for his parcel.
Cost of two stamps of Rs 10 each = Rs 10 × 2
= Rs 20
Total cost of two stamps of Rs 10 each and one stamp of Rs 5 = Rs 20 + Rs 5
= Rs 25

(3)
Rahul can buy ten stamps of Rs 2 each and one stamp of Rs 5 in order to buy stamps of Rs 25 for his parcel.

Cost of ten stamps of Rs 2 each = Rs 2 × 10
= Rs 20
Total cost of ten stamps of Rs 2 each and one stamp of Rs 5 = Rs 20 + Rs 5
= Rs 25

(4)
Rahul can buy three stamps of Rs 5 each and five stamps of Rs 2 each in order to buy stamps of Rs 25 for his parcel.
Cost of three stamps of Rs 5 each = Rs 5 × 3
= Rs 15
Cost of five stamps of Rs 2 each = Rs 2 × 5
= Rs 10
Total cost of three stamps of Rs 5 each and five stamps of Rs 2 each = Rs 15 + Rs 10
= Rs 25

(5)
Rahul can buy three stamps of Rs 5 each and one stamp of Rs 10 in order to buy stamps of Rs 25 for his parcel.
Cost of three stamps of Rs 5 each = Rs 5 × 3
= Rs 15
Total cost of three stamps of Rs 5 each and one stamp of Rs 10 = Rs 15 + Rs 10
= Rs 25