SOLUTION: On​ Monday, Harold picked up two donuts and five large coffees for the office staff. He paid $ 5.47 .  On​ Tuesday, Melinda picked up five donuts and four large coffees fo

Algebra ->  Customizable Word Problem Solvers  -> Numbers -> SOLUTION: On​ Monday, Harold picked up two donuts and five large coffees for the office staff. He paid $ 5.47 .  On​ Tuesday, Melinda picked up five donuts and four large coffees fo      Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


    

Question 1152248: On​ Monday, Harold picked up two donuts and five large coffees for the office staff. He paid $ 5.47 .  On​ Tuesday, Melinda picked up five donuts and four large coffees for the office staff. She paid $ 6.79 .  What is the cost of one​ donut? What is the cost of one large​ coffee?
Found 2 solutions by josgarithmetic, MathTherapy:
Answer by josgarithmetic(39630) About Me  (Show Source):
You can put this solution on YOUR website!
system%282d%2B5c=5.47%2C5d%2B4c=6.79%29
If you want to start with Elimination Method, multiply first equation by 5, and the second equation by 2.,...

Doing that, the system is the same as system%2810d%2B25c=27.35%2C10d%2B8c=13.58%29

Subtract Equation 2 from Equation 1:
17c=27.35-13.58
17c=13.77
c=0.81---------price for 1 coffee
.
.

Answer by MathTherapy(10557) About Me  (Show Source):
You can put this solution on YOUR website!

On​ Monday, Harold picked up two donuts and five large coffees for the office staff. He paid $ 5.47 .  On​ Tuesday, Melinda picked up five donuts and four large coffees for the office staff. She paid $ 6.79 .  What is the cost of one​ donut? What is the cost of one large​ coffee?
$1.97 can NEVER be the cost of 1 coffee. Since 4 were purchased, wouldn't that make the cost of the 4, $7.88? Isn't that more

than the cost of 4 large cups of coffee, and 5 donuts? How could that be? 

It's better if you try to solve this yourself because as usual, the person who responded is definitely not helping you!