» CC HOME » FORUM HOME

 College Confidential math question
 User Name Remember Me? Password New User

Welcome to College Confidential!
The leading college-bound community on the web
Join for FREE now, and start talking with other members, weighing in on community polls, and more.

Also, by registering and logging in you'll see fewer ads and pesky welcome messages (like this one)!
 Discussion Menu »Discussion Home »Help & Rules »Latest Posts »NEW! CampusVibe™ »Stats Profiles Top Forums »College Chances »College Search »College Admissions »Financial Aid »SAT/ACT »Parents »Colleges »Ivy League Main CC Site »College Confidential »College Search »College Admissions »Paying for College Sponsors SuperMatch - The Future of College Search! CampusVibe - Almost As Good As A Campus Visit!
 07-08-2008, 05:37 AM #1 Senior Member   Join Date: May 2008 Posts: 2,194 math question the price of ground coffee beans is d dollars for 8 ounces and each ounce makes c cups of brewed coffee. in terms of c and d, what is the dollar cost of the ground coffee beans required to make 1 cup of brewed coffee? a. d/8c b. cd/8 c. 8c/d d. 8d/c e. 8cd how do i approach this problem? its always confusing when it has 3 diff things going on =/ Reply
 07-08-2008, 06:02 AM #2 Member   Join Date: Apr 2008 Location: In the dark alleyways of Compton Posts: 507 its A. i dont know how to explain it.. i can just do it in my head Reply
 07-08-2008, 06:20 AM #3 Member   Join Date: Jun 2008 Location: Hamilton, New York Posts: 893 1 ounce -> c cups 8 ounces -> 8c cups d dollars -> 8 ounces -> 8c cups d dollars -> 8c cups divide by 8c throughout to get d/8c dollars -> 1 cup Reply
 07-08-2008, 01:46 PM #4 Member   Join Date: Nov 2006 Posts: 687 You can use the the pick numbers method. Let say 8 dollars buys you 8 ounces, in which each ounce makes 2 cups. So that costs 1 dollars per ounce, which will make 2 cups. This is the same as .50 dollars to make 1 cup. Now plug in 8 for d, and 2 for c, and see which answer gets you .5. A. (8)/(8x2)= .5 A is your answer (BTW if you use this method, you need to make c an integer greater than 1.) Reply
 07-08-2008, 02:00 PM #5 Junior Member   Join Date: Jan 2008 Posts: 276 Keeping track of units can quickly solve a lot of these problems. You know that dollars has to be in the numerator because your answer is in dollars per cup. This eliminates C. You know that cups has to be in the denominator, again, dollars per cup. This eliminates B and E. Between A and D you need to identify whether you should divide or multiply by 8, and since you have dollars given in "per 8 ounces" you would divide to get dollars "per ounce." Reply
 07-08-2008, 02:05 PM #6 Senior Member   Join Date: May 2007 Location: Swarthmore Posts: 3,227 Oh these are always confusing. Let's say it costs 80 dollars for 8 oz. That's 10 dollars for 1 oz. And each ounce makes 5 cups of coffee. So it costs 2 dollars per cup. Clearly I first did 80/8 , and then that divided by 5, which is the same as d/(8c). It's the same method as Ivyleague's. Reply
 07-08-2008, 08:27 PM #7 Junior Member   Join Date: May 2008 Posts: 72 these are confusing. i always missed these until a teacher taught me a trick. It says "d dollars for 8 oz" which is the same as "\$d/8oz." Next it says 1 ounce = c cups, so 8 ounces = 8c cups you want cups not ounces so replace 8oz in \$d/8oz with 8c, leaving d/8c. it's kinda weird method, but it works for me and many people at my school. Reply

 Bookmarks