A man buys postage stamps of 25 paise and 50 paise denominations for Rs.10. He buys 25 stamps in all. Find the number of 25 paise stamps he purchased.
10
Let the number of 25 paise stamps be x.
And number of 50 paise stamps be y.
x + y = 25 ….(i)
25x + 50y = 1000
⇒ x + 2y = 40 ….(ii)
On subtracting (i) from (ii)
y = 15
On substituting value of y in (i), we get
x + 15 = 25
⇒ x = 25 – 15 = 10
Number of 25 paise stamps = 10 and
Number of 50 paise stamps = 15