Answer :
Answer:
Originally there were 30, 25 cents stamps and 20, 15 cent stamps.
Step-by-step explanation:
We are given the following in the question;
Let x be the number of 25 cents stamps and y be the number of 15 cents stamps.
Marci has a total 50 stamps.
Thus, we can write
[tex]x+y=50[/tex]
Also,
[tex]x = \dfrac{y}{2}[/tex]
Total cost = $16.50
Thus, we can write the equation:
[tex]0.25x + 0.15y = 16.50[/tex]
Solving the two equations:
[tex]0.25\dfrac{y}{2} + 0.15y = 16.50\\\\(0.125+0.15)y = 16.50\\y = 60\\x = 30[/tex]
Originally,
[tex]x+y = 50\\30 + y = 50\\y = 20[/tex]
Thus, originally there were 30, 25 cents stamps and 20, 15 cent stamps.