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
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.
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.
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
Probably this comes too late but I'll post it nevertheless:
Let x denote the number of nickel coins, then the value of these coins is 0.05x
Let x+1 denote the number of quarter coins, then the value of these coins is 0.25(x+1)
Let x+5 denote the number of dime coins, then the value of these coins is 0.1(x+5)
Sum up the values
Expand the brackets, collect like terms and solve for x.
I've got x =18.