Question

Fatima wants to mail three parcels to three village schools. She finds that the postal charges are Rs 20, Rs 28 and Rs 36, respectively. If she wants to buy stamps only of one denomination, what is the greatest denomination of stamps she must buy to mail the three parcels?

Answer 1

"Given: Fatima wants to mail three parcels to three village schools. She finds that the postal charges are Rs 20, Rs 28 and Rs 36, respectively.

To find: The greatest denomination of stamps

We need to take the hcf

hcf(28,20)=

28=20×1+8

20=8×2+4

8=4×2+0

HCF of 28 and 20 is 4

Hcf (36 and 4)=4

Therefore, the denomination is 4"

Answer 2

Take the HCF of 20,28 &36.

It is 4 .

So,the answer is 4.