I have 20 rupees. I bought 1, 2, 5 rupee stamps. They are different in numbers by the reason of no change, the shop keeper gives 3 one rupee stamps. So how many stamp(s) I have.	Select the correct option
A) 9	B) 10	C) 11	D) 12	E) 13
5x+2y = 17   where, x and y are integer.   x = 3, y= 1 (possible)   y= 6, x = 1 (possible)   =&gt; as they are different in number so, x is not equal to 3   one rupee coin = 3   2 two coin = 6   5 rupee coin = 1   Total = 10.   ANSWER:10
<result>B</result>
I have 20 rupees. I bought 1, 2, 5 rupee stamps. They are different in numbers by the reason of no change, the shop keeper gives 3 one rupee stamps. So how many stamp(s) I have.