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10-03-2008, 09:28 AM
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| |  concentration problem
Freezing weather is coming!
The radiator in my 450 John Deere track loader
is full with 18 quarts of fluid that is 15% antifreeze.
Question: How much must I drain out into a disposable container,
Then retighten drain plug, and pour back 100% pure
antifreeze into radiator to make 18 quarts of 40%
antifreeze. |
10-03-2008, 10:04 AM
|  | Eater of Worlds | | Join Date: Jul 2006 Location: Chaneysville, PA
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Let x=amount to be drained.
Original mixture less amount drained: (18-x)
Amount of pure antifreeze=.15(18-x)
plus
pure antifreeze is x quarts.
The new mixture is 40%= .4(18)=7.2
So, we have the equation to solve:
.15(18-x)+x=7.2
__________________  Zenophobia: the irrational fear of convergent sequences.
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10-03-2008, 10:37 AM
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i think i get it... so would the answer be -5.3 qts... that doesnt make sense |
10-03-2008, 10:52 AM
|  | Red Baron | | Join Date: Apr 2007 Location: South African Republic
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Quote:
Originally Posted by Amelia  i think i get it... so would the answer be -5.3 qts... that doesnt make sense | Check again. I get +5.29
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10-03-2008, 11:00 AM
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is there ne way i could help on one more problem... it has to do with quarters, nickles, and dimes for some reason i cant get it:
I have a collection of nickels, dimes, and quarters
in a money bag worth $7.95. If the number of
quarters is one more than the number of nickels
and the number of dimes is five more than the number
of nickels, find the number of each type of coin.
# Nickels ________
# Dimes_________¬
# Quarters________ |
10-03-2008, 11:05 AM
| | Red Baron | | Join Date: Apr 2007 Location: South African Republic
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Quote:
Originally Posted by Amelia is there ne way i could help on one more problem... it has to do with quarters, nickles, and dimes for some reason i cant get it:
I have a collection of nickels, dimes, and quarters
in a money bag worth $7.95. If the number of
quarters is one more than the number of nickels
and the number of dimes is five more than the number
of nickels, find the number of each type of coin.
# Nickels ________
# Dimes_________¬
# Quarters________ | In future, please make a new thread for each new question.
Okay we have 3 different types of coins.
So:
x + y + z = 7,95
Nickels = x
Quarters = y = x + 1
Dimes = z = x + 5
So you'll just need to substitute the values of these coins. And solve.
a(x) + b(x + 1) + c(x + 5) = 7,95
Where a;b;c are the monetary values of nickels, dimes, and quarters (not respectively!). I don't know the American system.
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Peace is not an absence of war.
It is a virtue, a state of mind.
A disposition for benevolence. Confidence. Justice.
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10-03-2008, 11:28 AM
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would that make x 8.4 ? im confused  a little: in america dime=.10 nickels=.5 and quarters=.25
i'm confused |
10-03-2008, 11:36 AM
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Quote:
Originally Posted by Amelia would that make x 8.4 ? im confused a little: in america dime=.10 nickels=.5 and quarters=.25
i'm confused | Can you double check the question?
__________________
Peace is not an absence of war.
It is a virtue, a state of mind.
A disposition for benevolence. Confidence. Justice.
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10-03-2008, 11:44 AM
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yea :
I have a collection of nickels, dimes, and quarters
in a money bag worth $7.95. If the number of
quarters is one more than the number of nickels
and the number of dimes is five more than the number
of nickels, find the number of each type of coin.
# Nickels ________
# Dimes_________¬
# Quarters________
nickels are worth .5
dimes are worth .10
quarters are worth .25
a dollare is 1.00 |
10-03-2008, 11:47 AM
| | Red Baron | | Join Date: Apr 2007 Location: South African Republic
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Quote:
Originally Posted by Amelia yea :
I have a collection of nickels, dimes, and quarters
in a money bag worth $7.95. If the number of
quarters is one more than the number of nickels
and the number of dimes is five more than the number
of nickels, find the number of each type of coin.
# Nickels ________
# Dimes_________¬
# Quarters________
nickels are worth .5
dimes are worth .10
quarters are worth .25
a dollare is 1.00 | Either the question has a fault, or I made a very stupid mistake in my calculations. The latter being very likely.
You have the idea though, that should carry you through.
__________________
Peace is not an absence of war.
It is a virtue, a state of mind.
A disposition for benevolence. Confidence. Justice.
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