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Question 224866: A chemist wants to make 250 ml of 30% acid solution by mixing a 20% acid solution with a 60% acid solution. determine how much acid solution should be used as follows. x represents the amount of 20% acid solution. y represents the amount of 60% acid solution.
write an equation relating x and y to the desired amount of acid.
Click here to see answer by checkley77(12844)

Question 224839: A gas station owner has 30 gallons of gasoline worth $1.20 per gallon and some worth $1.40 a gallon. How much gallons of the 1.40 brand must the owner mix in ro produce gasoline that costs $1.28 per gallon
Click here to see answer by checkley77(12844)

Question 224932: You buy a square lot that is 110 yd on all four sides.
What is its size in acres?

Click here to see answer by RAY100(1637)

Question 225167: I need HELP!!! Can you please help me???
Solve by writing a system of equations.
The federal tax on a $12,000 salary was 8 times the state tax. The combined taxes were $2,700. Find the state's share of taxes.
Click here to see answer by Alan3354(69443)

Question 225163: I need HELP!!! Can you please help me???
Solve by writing a system of equations.
It takes 4 hours for a boat to travel 56 miles downstream. The same boat can travel 36 miles upstream in 6 hours. Find the rate of speed of the boat in still water and the rate of the current.
Click here to see answer by ankor@dixie-net.com(22740)

Question 225271: An automobile radiator contains 16 liters of antifreeze and water. This mixture is 30% antifreeze. How much of this mixture should be drained and replaced with pure antifreeze so that there will be 50% antifreeze?
Click here to see answer by josmiceli(19441)

Question 225460: How much water should be added to 16 mL of 20% alcohol solution to reduce the concentration to 8%?
Click here to see answer by josmiceli(19441)

Question 225460: How much water should be added to 16 mL of 20% alcohol solution to reduce the concentration to 8%?
Click here to see answer by checkley77(12844)

Question 225668: A 3% solution of sulfuric acid was mixed with an 18% solution to produce an 8% solution. how much 3 % solution and 18% solution were used to produce 15 liters of 8% solution?
Click here to see answer by checkley77(12844)

Question 225710: The owner of a pet food store wants to mix birdseed that costs $1.25 per pound with sunflower seeds that cost $0.75 per pound to make 50 pounds of a mixture that costs $1.00 per pound. HOw many pounds of each seed should he use?
Click here to see answer by checkley77(12844)

Question 225941: How many gal. of a 65% saline solution
must be mixed with 8 gal. of pure water to
make a 25% solution?
Click here to see answer by nerdybill(7384)

Question 225993: A boat is pulled toward dock by means of a rope wound on a drum that is located 6ft above the bow of the boat. if the rope is being pulled in at the rate of 6ft/sec, how fast is the boat approaching the dock when it is 24ft from the dock?
Click here to see answer by Edwin McCravy(20056)

Question 226028: one salt solution is 15% and another is 20% salt. How many cubic centimeters of each solution must be mixed to obtain 50 cubic centimeters of 16% solution?
Click here to see answer by ankor@dixie-net.com(22740)

Question 226586: how much water should be evaporated from 24 oz of a 4% solution to make a 6% salt solution
Click here to see answer by RAY100(1637)

Question 226639: What quantity of 75 per cent acid solution must be mixed with a 30 percent solution to produce 1215 mL of a 50 per cent solution?
Click here to see answer by checkley77(12844)

Question 227122: Can anyone please help me with this please

In your own words explain the difference between �descriptive statistics� and �inferential statistics.� Do not just give definitions.
b. In your own words, define the four different sampling techniques.
c. Develop your own hypothesis about a situation of interest, for example: ��Middle income families containing four members spend 10% of their gross income on clothing per year.�
d. Select one of the four sampling techniques and give a detailed design of how you would gather sampling data to answer your hypothesis.
e. Select a second sampling technique for the same hypothesis and give a second detailed design of how you would gather sampling data.
f. Comment on two of your classmates� postings. Explain to the author which of their two sampling designs seems better or more appropriate for gathering unbiased random data for their given hypothesis.
Click here to see answer by solver91311(24713)

Question 226964: A pharmacist wants to make a solution that is 60% alcohol. On the shelf are two bottles of 40% and 20% strength alcohol. Explain the step(s) and the outcome of this mixture.
Click here to see answer by ankor@dixie-net.com(22740)

Question 227241: A chemist has some 12% hydogen peroxide solution and some 9% hydogen peroxide solution. how many milliters of each should be mixed to make a 450-milliter solution that is 10% hydogen peroxide?
Click here to see answer by checkley77(12844)

Question 227239: A chemist has some 12% hydogen peroxide solution and some 9% hydogen peroxide solution. how many milliters of each should be mixed to make a 450-milliter solution that is 10% hydogen peroxide?
Click here to see answer by checkley77(12844)

Question 227286: An 18 quart radiator contains a 40% solution of antifreeze. How much must be drained out and replaced with pure antifreze to obtain a 70% antifreeze solution?
Click here to see answer by checkley77(12844)

Question 227284: How many millimeters of pure acid must be added to 120 milliliters of a 30% acid solution to obtain a 50% solution?
Click here to see answer by checkley77(12844)

Question 227277: peanuts sell for $3 per pound. cashews sell for $6 per pound. how many pounds of cashews should be mixed with 12 pounds of peanuts to obtain a mixture that sells for $4.20 per pound?
Click here to see answer by checkley77(12844)

Question 227466: Find the quadratic equation with integral coefficient whose roots are negative 2 and three fifths.
Click here to see answer by jsmallt9(3758)

Question 227560: Find the cost per pound of a trail mix made from 10 lb of raisins that cost $4.20 per pound and a 90 lb of granola that costs $5.60 per pound
Click here to see answer by checkley77(12844)

Question 227659: How much pure antifreeze should be added to a gallon of 70% antifreeze solution to make a 90% antifreeze solution?
Click here to see answer by nerdybill(7384)

Question 227566: Dr. Wilson purchased a luxury car for $32,500. This is $7,000 more than twice the price her husband paid for a commuter car earlier that year. Find the price of the commuter car.
Click here to see answer by checkley77(12844)

Question 227415: Mixing Solutions. Many occupations require the mixture of liquids to create a needed solution of a certain strength. Since the strength of a solution is dependent on the customers need, stockpiling all strengths is not economically possible. So, the solution is made to order.
Question 1: A pharmacist wants to make a solution that is 60% alcohol. On the shelf are two bottles of 40% and 20% strength alcohol. Explain the step(s) and the outcome of this mixture.

Click here to see answer by ankor@dixie-net.com(22740)

Question 227839: A bag of peanuts is worth 30 cents less than a bag of cashews. Equal amounts of peanuts and cashews are used to make 40 bags of a mixture that sells for $1.05 per bag. How much would a bag of cashews be worth?
Click here to see answer by ankor@dixie-net.com(22740)

Question 227894: how much water should you add to 150 ml of a 25% salt solution to make the solution 15% salt?
Click here to see answer by josmiceli(19441)

Question 227856: How much water must be mixed with 7 pints of 50% developer to make a mixture that is 13% developer?
Click here to see answer by ptaylor(2198)

Question 227945: Algebra:how much water must be boiled away to increase the concentration of 300 gallons of salt solution from 2% to 3%?
Click here to see answer by checkley77(12844)

Question 227889: this month's rainfall is 5 inches lower than last month's rainfall of 9 inches
Click here to see answer by checkley77(12844)

Question 227994: A chemist needs 130 milliliters of a 28% solution but has only 19% and 58% solutions available. Find how many milliters of each that should be mixed to get the desired solution.
Click here to see answer by ankor@dixie-net.com(22740)

Question 228271: soybean meal is 14% protein, cornmeal is 7% protein how many pounds of each would be needed to make a 280lb mixture that is 10% protein?
Click here to see answer by checkley77(12844)

Question 228341: How many liters of a 60% acid solution must be mixed with a 75% acid solution to get 20 L of a 72% solution?
Click here to see answer by checkley77(12844)

Question 228603:
A chemist has one solution containing a 16% concentration of acid and a second solution containing a 26% concentration of acid. How many milliliters of each should be mixed in order to obtain 30 milliliters of a solution containing an 18% concentration of acid?
Click here to see answer by checkley77(12844)

Question 228403: A mixture of 10% acid and 90% water is added to 5 liters of pure acid. the final mixture is 40% water . How many liters of water are in the final mixture?
thanks
Click here to see answer by ankor@dixie-net.com(22740)

Question 228824: Please help me solve this:
Find the amount of a 12% saline solution a lab assistant should add to 80 cc(cubic centimeters) of a 22% saline solution in order to have a 16% solution.
Click here to see answer by solver91311(24713)

Question 228894: Dan is 1/6 his father's age. In 4 years, Dan will be 1/4 his fathers age. what is Dan's age?
Click here to see answer by ankor@dixie-net.com(22740)

Question 228894: Dan is 1/6 his father's age. In 4 years, Dan will be 1/4 his fathers age. what is Dan's age?
Click here to see answer by edjones(8007)

Question 228905: If you have 90 ounces of water to make a 10% salt solution, what is the decrease in ounces of water to make a 15% salt solution.
Click here to see answer by josmiceli(19441)

Question 229250: how many liters of 75% gas and 90% gas would you need for 1200 liters of 85% gas?
Click here to see answer by checkley77(12844)

Question 229261: How much water must be added to 16 liters of a 30% solution to get a solution that is 22% acid? Please show the steps, so that I may do the same with a similar problem.
Thank you.
Byron
Click here to see answer by Alan3354(69443)

Question 229187: A grocer mixed nuts worth 85 cents per pound with nuts worth 55 cents per pound. How many pounds of each kind did he use to make a mixture of 60 pounds to sell at 75 cents per pound?
I believe the equations are 0.85x+0.55y=45 and x+y=60 and the answers are y=20 and x=40, but I am not sure. May you please help me?
Thank you very much!
Click here to see answer by ankor@dixie-net.com(22740)

Question 229501: Show an equation and a solution. How much pure antifreeze must be added to 12 L of a 40% solution to obtain a 60% solution. (Remember that pure antifreeze is 100% = 1.)
Click here to see answer by edjones(8007)

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