I've tried several equations to no avail. Please help :)

"A person changed $200 into five- and ten- dollar bills. The person then had 28 bills in all. How many ten-dollar bills were there? What was the value of the five-dollar bills?"

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- May 12th 2012, 06:43 AMBuilderjay2011Word problem involving currency...
I've tried several equations to no avail. Please help :)

"A person changed $200 into five- and ten- dollar bills. The person then had 28 bills in all. How many ten-dollar bills were there? What was the value of the five-dollar bills?" - May 12th 2012, 06:47 AMskeeterRe: Word problem involving currency...
- May 12th 2012, 06:56 AMBuilderjay2011Re: Word problem involving currency...
Sorry I do not understand.

- May 12th 2012, 07:05 AMskeeterRe: Word problem involving currency...
- May 12th 2012, 07:22 AMBuilderjay2011Re: Word problem involving currency...
Does this make any sense? My teacher showed me this set-up which was totally different from yours.

*Let 5f = number of five dollar bills*

Let 10(28-f) = number of ten-dollar bills

200 = 5f + 10(28-f)

200 = 5f + 280-10f

200 - 280 = 5f - 10f

-80 = -5f

f = 16 number of five-dollar bills

28 - 16 = 12 number of ten-dollar bills

$120.00 value of ten-dollar bills

$80.00 value of five-dollar bills - May 12th 2012, 08:59 AMskeeterRe: Word problem involving currency...
- May 12th 2012, 09:04 AMWilmerRe: Word problem involving currency...
If that's EXACTLY what your teacher showed, then your teacher needs further training!

"Let 5f = number of five dollar bills": that' s not the number of $5 bills, it's the VALUE of the $5 bills.

Did your teacher not show this way:

Let f = number of $5 bills; then 28-f = number of $10 bills?

Then proceeded to:

5f + 10(28 - f) = 200

????? - May 12th 2012, 12:01 PMbjhopperRe: Word problem involving currency...
In problems like this one it is usually easier to write an equation in one unknown

- May 12th 2012, 02:42 PMWilmerRe: Word problem involving currency...