Sign Up For Free

**Join for FREE**,
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!)

- Reply to threads, and start your own
- Create reports of your
**campus visits** - Share college
**photos**and**videos** **Find your dream college**, save your search and share with friends- Receive our
**monthly newsletter**

College Confidential’s “Dean,” Sally Rubenstone, put together 25 of her best tips. Get your free copy of the "25 Tips from the Dean" eBook and get helpful advice on how to choose a college, get in, and pay for it: http://goo.gl/9zDJTM

Ren the SAT'er
Posts: **2,303**Registered User Senior Member

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 =/

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 =/

Post edited by Ren the SAT'er on

## Replies to: math question

602- Member976Registered User Member8 ounces -> 8c cups

d dollars -> 8 ounces -> 8c cups

d dollars -> 8c cups

divide by 8c throughout to get

d/8c dollars -> 1 cup

698Registered User MemberLet 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.)

324Registered User Member3,267Registered User Senior MemberLet'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.

74Registered User Junior MemberIt 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.