Rohit purchased 52 stamps of 25 paise and 50 paise. The total amount he spent on stamps was Rs.22.25. How much amount did Rohit spend on the 50 paise stamps ?
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Assume the number of 25 paise stamps is x, and the number of 50 paise stamps is y.
From the first given, the number of purchased stamps is 52.
Therefore, x+y=52 (1)
From the second given, the total amount spent on stamps is 22.25 rs. Therefore, 0.25x+0.5y=22.25 (2)
Multiply equation 2 by -2:
-0.5x-y=-44.5 (3)
Now we need to solve equation 1 and equation 3 simultaneously:
0.5x = 7.5
x=15
Therefore, y = 52-15 = 37
The amount of money spent on the 50 paise stamps is 37(0.5)=18.5 Rs.
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