Got Homework?
Connect with other students for help. It's a free community.
Here's the question you clicked on:
 0 viewing
xokatexo
Group Title
A purse containing $3.20 in quarters and dimes has, in all, 20 coins. Find the number of each kind of coin.
 2 years ago
 2 years ago
xokatexo Group Title
A purse containing $3.20 in quarters and dimes has, in all, 20 coins. Find the number of each kind of coin.
 2 years ago
 2 years ago

This Question is Closed

cgreenwade2000 Group TitleBest ResponseYou've already chosen the best response.0
So Quarters (q) + Dimes (d) = 20 and .25q + .1(d) = 3.20
 2 years ago

cgreenwade2000 Group TitleBest ResponseYou've already chosen the best response.0
From here, we can solve for q or d. q+d=20 So d=20q
 2 years ago

cgreenwade2000 Group TitleBest ResponseYou've already chosen the best response.0
Now, we'll go into our second equation and solve it by replacing d with 20q So our problem looks like .25q +.1(20q) = 3.20
 2 years ago

cgreenwade2000 Group TitleBest ResponseYou've already chosen the best response.0
I'll let you solve the rest. But do you see how I set up both equations? The number of quarters is unknown so I called it q. The number of dimes is unknown so I called it d. I know that the number of quarters plus the number of dimes is equal to 20, so my equation became q+d=20 Then, the value of a quarter is .25 so I multiply that by the number of quarters, giving me .25q. Then, the value of a dime is .10 so I multiply that by the number of dimes, giving me .1d. So .25q+.1d=3.20
 2 years ago
See more questions >>>
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.