If Devin has 13 quarters and dimes in his pocket, and they have a combined value of 250 cents, how many of each coin does he have?

Question

I need to know how much quarters and dimes he has in his pocket. And that they add up to 250 cents. 

 

Answer 1

q = number of quarters worth 25 cents each

13 - q = number of dimes worth 10 cents each

 

25q + 10(13 - q) = 250

 

Solve for q, get 13 - q, and finish.