I have 20 coins in my pocket. They are all quarters and dimes. The coins are worth $3.35. How many of each coin do I have in my pocket?

Question

i need help finding out how many of each quater and dimes but there can only be 20 total

 

 

Answer 1

Q + D = 20

.25Q + .10D = 3.35

 

Express the first equation in terms of dimes and substitute in the second equation, then solve for the one variable.

 

Q = 20 - D

.25(20 - D) + .10 D = 3.35

5 - .25D + .10D = 3.35

.15D = 1.65

D = 1.65 / .15

D = 11

 

that should help you solve the rest.