Answer :

Let us assume the number of stamps of 20p and 25p be x and y respectively

According to the question, we have


x + y = 47 …(i)


0.20x + 0.25y = 10


Also, 4x + 5y = 200 …(ii)


From equation (i), we have


y = 47 – x


Now, putting the value of y in (ii), we get


4x + 5 (47 – x) = 200


4x – 5x + 235 = 200


x = 235 – 200


x = 35


Now putting the value of x in (i), we get:


35 + y = 47


y = 47 – 35


y = 12


Hence, the number of 20p stamps are 35 and the number of 25p stamps are 12


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