2. A coin purse contains d dimes and q quarters. There are 20 coins in the purse, and the total value of the coins is $4.25. Which system of equations represents this situation? 
A {d + q = 4.25
 {0.1d + 0.25q = 20
B {d + q = 20
 {0.1d + 0.25q = 4.25
C {d + q = 20
 {d + q = 4.25