Aayan bought as many 25 paisa postal stamps as 50 paise stamps and paid Rs. 9 fir them. How many stamps of each denomination did he buy.
Let the number of each stamp be ‘x’
MOney by 25 paise stamp =25*x paise
MOney by 50 paise stamp =50*x paise
Total paise = 900
75x=900
x=12