Questions on Word Problems: Mixtures answered by real tutors!

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Question 725629: how many grams of 5% antiseptic solution must be added to 300g of a 10% solution to produce an 8% solution?
Click here to see answer by stanbon(75887)

Question 725756: Please help me solve this problem: A nut mix is to be prepared with cashews, almonds and peanuts in the ration of 1:1:3 by weight. If you have 8 ounces of cashews, how many ounces of almonds and peanuts are needed? What will be the total weight of this mix?
Click here to see answer by checkley79(3341)

Question 725836: How many liters of grape juice must be added to 14 L of cranberry juice to make a drink that is 16% grape juice?
Click here to see answer by stanbon(75887)

Question 725814: A canoe trip upstream to a campground takes six hours.
The trip back downstream takes three hours.
The current flows at 3 miles per hour.
Write an equation for total roundtrip distance travelled (d) in terms of your still water speed.
Click here to see answer by richwmiller(17219)

Question 725806: how many tablespoons of pure butter would need to be mixed with 60 tablespoons of a 50% butter spread to get a 70% butter spread
Click here to see answer by richwmiller(17219)

Question 726103: If I have 100ml of a 6% solution; how do I dilute that to a 3% solution?
Thank you,
chere
my thought is that I would take 94% of 100ml and then add that to the 6% solution?
Click here to see answer by Theo(13342)

Question 726142:
A pharmacist needs 70 liters of a 50% alcohol solution. She has available a 30% solution and a 80% solution. How many liters of each solution should she mix to obtain what she needs?
Click here to see answer by checkley79(3341)

Question 726611: A food store makes a 11�pound mixture of peanuts, almonds, and raisins. The cost of peanuts is $1.50 per pound, almonds cost $3.00 per pound, and raisins cost $1.50 per pound. The mixture calls for twice as many peanuts as almonds. The total cost of the mixture is $21.00. How much of each ingredient did the store use?
Click here to see answer by stanbon(75887)

Question 726624: An urn contains green and pink balls. Five balls are randomly drawn from the urn in succession, with replacement. That is, after each draw, the selected ball is returned to the urn. What is the probability that all balls drawn from the urn are pink? Round your answer to three decimal places.
Click here to see answer by tanjo3(60)

Question 726776: To the nearest mL, how much 0.3% ampicillin in solution do you have to add to 40 mL of 0.5% ampicillin in solution to create 0.4% ampicillin in solution?
Click here to see answer by Alan3354(69443)

Question 726744: How much pure water has to be added to a 5%salt solution to end up with 20 gallons of a 3% solution?
Click here to see answer by lynnlo(4176)

Question 726860: Please help... first time algebra student since high school 25 years ago. Thank you in advance!
A quart bottle of a drain cleaning solution is 25% sodium hydroxide (chemical formula NaOH) by weight. One quart of the solution weighs 2 lb. How many ounces of pure NaOH should be added to give a solution that is 30% NaOH by weight?

Click here to see answer by DrBeeee(684)

Question 726836: How much pure water has to be added to a 5% salt solution to end up with 20 gallons of a 3% solution?
Click here to see answer by josgarithmetic(39617)

Question 726945: The hydrogen ion concentration of a substance is about moles per liter. Find the pH.
Round to the nearest tenth. Use the formula pH= -log[H+]
Possible answers
A) -10.9
B) 10.9
C) 9.0
D) None
E) 9.5
Click here to see answer by josgarithmetic(39617)

Question 726987: You are making iced tea for a friend who prefers it at 80% strength. The function gives the concentration of the tea after adding x fluid ounces of a 50% tea solution to 6 fluid ounces of 100% strength tea. How many fluid ounces of 50% strength tea should you add to 6 fl oz of 100% strength tea?
Click here to see answer by stanbon(75887)

Question 727123:
A chemist needs to produce a 60% acid mixture. She has 25% strength solution and 80% strength solution on hand.
Rounding to the nearest thousandth (3 decimal places; nearest mL), how many liters of 80% solution does she add to create 1 liter of the 60% strength mixture?

Click here to see answer by stanbon(75887)

Question 727128: How many liters of a 10% solution of acid should be mixed with 60% solution of acid to obtain 20 liters of 50% solution?
I need to solve this using systems of Equations, but I have no idea how to set it up. I have so far stated that x = 10% solution and that y = 60% solution
Click here to see answer by stanbon(75887)

Question 727133: How many grams of lidocaine total are in 200 mL of 2% lidocaine solution added to 300 mL of 3% lidocaine solution
Click here to see answer by stanbon(75887)

Question 727140: A liquid medicine solution is 5% liquid Curitall by volume. To the nearest mL, how many mL of solution do you need to
have 40 mL of pure Curitall?
Click here to see answer by jim_thompson5910(35256)

Question 727081:
Last year, Lena had $10,000 to invest. She invested some of it in an account that paid 8% simple interest per year, and she invested the rest in an account that paid 5% simple interest per year. After one year, she received a total of $770 in interest. How much did she invest in each account?
Click here to see answer by checkley79(3341)

Question 727245: Rabbits in a lab are to be kept on a strict daily diet that includes 30 grams of protein, 16 grams of fat and 24 grams of carbohydrates. the scientist has only three food mixes available with the following grams of nutrients per unit.
Protein fat carbohydrate
mix A 4, 6, 3
mix B 6, 1, 2
mix C 4, 1, 12
Find how many units of each mix are needed daily to meet each rabbits dietary need.
(Linear equations)

Click here to see answer by jim_thompson5910(35256)

Question 727364: determine the percentage of a solution obtained by mixinng 300g of a 25% and 400g of a 40% solution
Click here to see answer by josgarithmetic(39617)

Question 727677: I have 550ml of a 70% solution. I want to make it an 80% solution. How many mls of a 90% solution must I add to the 70% to make it 80%?
Click here to see answer by josgarithmetic(39617)

Question 727811: Nuts to you Shoppe sells cashews for $15 per kg and pecans for $10 per kg. How many Kilograms of each should be mixed in order to get 20 kg of a mixture worth $12 per kg?
Click here to see answer by lynnlo(4176)

Question 727835: Feed A has 10% protein and feed B has 4% protein. How many pounds of each are mixed to get 85 pounds of feed with 8% protein. Write and solve the system.
Click here to see answer by richwmiller(17219)

Question 727784: Pure acid is to be added to a 10% acid solution to obtain 90L of 55% solution. What amounts of each should be used? A)How many liters of 100% pure acid should be used to make the solution? B)How many liters of the 10% solution should be in the mixture?
Click here to see answer by josgarithmetic(39617)

Question 728059: 2oz. of almonds were mixed with 6oz of walnuts which cost $4/oz to make mixed nuts which cost $4.25/oz. What is the price per ounce of almonds?
Click here to see answer by stanbon(75887)

Question 727984: a 20 liter container is filled with pure acid. five liters of the mixture are drawn off and replaced with water and so on until 5 drawing and 5 replacements have been made. find the amount of acid in the final mixture
Click here to see answer by josmiceli(19441)

Question 728071: bronze which costs $9.10/kg is made by combining copper which costs $8.90/kg with tin which costs $9.50/kg. Find the number of kg of copper required to make 16.6 kg of bronze?
Click here to see answer by josmiceli(19441)

Question 728099: How many liters of 20% and 60% acids must be mixed in order to make 12 liters of a 55% acid solution
Click here to see answer by stanbon(75887)

Question 728106: A 12 liters mixture is 60% alcohol. If 8 liters of a 25% alcohol mixture are added what percent mixture will be formed
Click here to see answer by stanbon(75887)

Question 728124: Water is flowing into a 5100 gallon pool at the rate of 40 gallons every 15 minutes. write an equation to describe the amount of water in the pool after t minutes.
Click here to see answer by josmiceli(19441)

Question 728460: how many liters of a 30% saline solution must be mixed with a 40% saline solution to obtain 25 liters of a 32% saline solution?
Click here to see answer by nerdybill(7384)

Question 728601: Sonya inherited $ 35,000. She invested some of the money at 2.5 % simple interest and the rest of 3.5 % simple interest. In the first year, she earned
$ 1,075 interest. How many dollars did she earn from her investment at 3.5 % interest ?
Click here to see answer by checkley79(3341)

Question 728598: A chemist must mix 6 liters of a 30% acid solution with some of an 80% acid solution to get a 50% acid solution to get a 50% acid solution. How many liters of the 80% solution should be used ?
Click here to see answer by checkley79(3341)

Question 728785: How many liters of water must be added to 10 liters of a 75% antifreeze solution in order to produce a 50% solution?
How many ounces of pure alcohol must be added to 40 ounces of a 70% alcohol solution to produce an 85% alcohol solution?
Click here to see answer by josgarithmetic(39617)

Question 729079: How many pounds of salted nuts selling at $1.60 per pound should be mixed with 2 pounds of salted nuts selling for $2.20 per pound to obtain a mixture selling for $1.72 per pound?
Click here to see answer by stanbon(75887)

Question 729166: a contractor mixes concrete from bags of pre-mix for small jobs. How many bags with 6% cement should he mix with 4 bags of 21% cement to produce a mix containing 9% cement?
Click here to see answer by josgarithmetic(39617)

Question 729214: Fifteen liters of fuel containing 3.2% oil is available for a certain two-cycle engine. This fuel is to be used for another engine requiring 5.5%.
Let x = the amount of pure oil
Click here to see answer by josgarithmetic(39617)

Question 729345: a dealer has 400 gallons of low octane gasoline worth $1.29 a gallon. How many gallons of high octane gasoline worth $1.35 a gallon should he blend with the low octane gasoline sa as to produce a mixture wirth $1.31 a gallon?
Click here to see answer by josgarithmetic(39617)

Question 729499: I have tried to do this word problem a couple of times, i have a very hard time just understanding where to even begin i draw a complete blank even with my notes, please help.
The area of a square, in square units, with side
x is given by the function A = x2. Find the
area of a square patio that is 40 feet long on a
side.
Click here to see answer by jim_thompson5910(35256)

Question 729515: I cannot figure a few word problems out and was wondering if you could help me set the two equations up.
1. How many gallons each of 15% alcohol and 30% alcohol should be mixed to get 30 gallons of 25% alcohol
2. A box contains $6.25 in nickles, dimes and quarters. There are 85 coins in all, with three times as many nickles as dimes. How many quarters are there

Click here to see answer by josmiceli(19441)

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