Questions on Word Problems: Mixtures answered by real tutors!

Tutors Answer Your Questions about Mixture Word Problems (FREE)

Question 26777: i dont get how to set the problem up. once i get the problem set up, i can do it. please help?
Your chemistry teacher asks you to mix 20% acid solution with 50% acid solution to obtain 12 ounces of 30% acid solution. how much of each must you use?
Click here to see answer by Paul(988)

Question 26782: i dont get how to set the problem up. once i get the problem set up, i can do it. using X and Y. and two equations. i need help! please?
Your chemistry teacher asks you to mix 20% acid solution with 50% acid solution to obtain 12 ounces of 30% acid solution. how much of each must you use?
Click here to see answer by bmauger(101)

Question 26968: Need help with Algebra word problem.
A science teacher has a 2 pint solution of 3% sulfuric acid. She needs to get a solution of 4% sulfuric acid. She only has a solution of 10% sulfuric acid to add to the 3% sulfuric acid. How much 10% sulfuric acid would she have to add to the 3% sulfuric acid to get the needed 4% solution.

Click here to see answer by Paul(988)

Question 27017: A designer attempts to arrange the characters of his artwork in the form of a square grid with equal numbers of rows and columns, but finds that 24 characters are left out. When he tries to add one more row and column, he finds that he has 25 too few characters. Find the number of characters used by the designer.
Um so yeah where in the world do i begin with this? I've been racking my brain and can't seem to get an answer...HELP!
Click here to see answer by venugopalramana(3286)

Question 27019: I need help on a mixture problem, I have tried to set the problem up, but these (percents) mess me up. How many oz. of an 8% alcohol solution must be mixed with a 12% alcohol sloution to obtain 100 oz. of a 12.2 alcohol solution?
I think it is 12.2(100)-.08x = .12(100=x), but i can't get it to work out into an answer I have to chose from.
Click here to see answer by josmiceli(19441)

Question 27063: Andrea is shopping at a bulk store. She needs to buy flour, sudar and salt. She needs twices as much flour as sugar and tic as musch sugar as salt. She plans to buy a total of 10.5 pounds of flour, sugar and salt combined. Flour is $1.20 a pound, sugar is $2.30 a pound, and salt is $.68 a pound. How much of each item will she need to buy and how much will it cost?
Click here to see answer by mbarugel(146)

Question 27140: Chas has some 12% acid solution and some 32% acid solution. Determine how much
of each he needs in order to get 40ml of a 20% acid solution.
I tried setting up the problem like this: .12(x)+ .32(x)=.2(40) but i didn't
get the answer right
Click here to see answer by AnlytcPhil(1806)

Question 27141: Mitchell has 10ml of a 30% saline solution, determine how much water he should add to get a 16% saline solution.
I set the problem up like this: .3(10+X)+x=.16(10+x)but i got the answer wrong. THe answer is 8.75ml of water but i don't know how to get to the answer correctly
Click here to see answer by Paul(988)

Question 27195: colette has some 8% acid to which she adds 10 liters of 20% acid to get a 15% acid solution determine how much 8% acid she needs.
Click here to see answer by Paul(988)

Question 27219: How much pure salt must be added to to 25 grams of a 12% salt solution to make it a 20% solution. I am having a very hard time trying to figure this problem out. Thanks for your help.
Dennis
Click here to see answer by Paul(988)

Question 27547: How many pounds of candy worth $3.60/pound must be added to 10 pounds of chocolate worth $2.40/pound to form a mixture worth $3.30/pound?

Click here to see answer by Paul(988)

Question 27604: A machine requires four hours to make a unit of Product A and three hours to make a unit of product B. Last month the machine operated for 200 hours producing a total of 60 units . How many units of Product A were produced
Click here to see answer by Paul(988)

Question 27788: How many kilograms of zinc that is 33% pure should be mixed with 12 kilograms of alloy that is 45% pure to make an alloy that is 39% pure zinc?
Click here to see answer by Paul(988)

Question 27791: I NEED HELP SOVING THIS PROBLEM. I KEEP COMING UP WITH NEGATIVE ANSWER.
HOW MUCH WATER SHOULD BE ADDED TO 30 GALLON OF A SOLUTION THAT IS 70%ANTIFREEZE IN ORDER TO GET A MIXTURE THAT IS 60%ANTIFREEZE
I CAME UP WITH -48
PLEASE HELP ME SOLVE THANK YOU
Click here to see answer by Paul(988)

Question 27794: Tin that was 48% pure was melted together with tin that was 44% pure to make 20 kilograms of an alloy that was 45% pure. How many kilograms of each were used? How do you set it up?
Click here to see answer by Paul(988)

Question 27934: Soybean meal is 16% protein. Corn meal is 10% protein. How much of each type should be mixed to bet a 15-lb mixture that is 12% protein?
Click here to see answer by Paul(988)

Question 27951: Please Help...I am totally confused!
A $120 coat goes on sale for $96. By what percent was the coat discounted?
The answer is suppose to be 20% but i can't figure out how to get it...help would be GREATLY appreciated! Thanks!♥
Click here to see answer by bmauger(101)

Question 28133: HEY! I am having a TON of problems w// Percent problems...could someone please help me?!? I have literally no clue what i am doing! Thanks♥♥!
The number of paid subscribers to The Wildlife Monthly has declined from 3340 people to 2430 people. What is the percent of decrease?
Thanks for the help!
♥Jenna♥
Click here to see answer by longjonsilver(2297)

Question 28294: How many quarts of a 50% solution of acid must be added to 20 quarts of a 20% solution of acid to get a 40% solution of acid?
Click here to see answer by Paul(988)

Question 28328: Mariel mixed 3 cups of red paint with 2 cups of yellow paint to make orange paint. If she has 7 cups of red paint, how many cups of yellow paint does she need to get the same shade of orange?
Click here to see answer by imthebestdude(2)

Question 28329: An isosceles triangle has two sides that measure 2 inches and one side that measure 3 inches.A similar isosceles triangle has two sides each 8 inches long.What is the length of the third side?
Click here to see answer by rabbitman11(2)

Question 28327: A recipe for gravy calls for 1/2 cup of flour for every 2 cups of water.How many cups of flour would be needed if 5 cups of water were used?
Click here to see answer by rabbitman11(2)

Question 28411: Please HELP me!! I am TOTALLY confused! Here is the problem♥:
Franklin can do a job in 6 h and Mike can do it in 4 h. What part of the job can they do by working together for 2 h? for y h?
♥Thanx sOo much♥
Click here to see answer by venugopalramana(3286)

Question 28487: Thirty pounds of dried fruit mix contained apples worth $3.15 a pound and pears worth $4.25 a pound. How many pounds of each did the mix contain if the value of the mix was $107.70?
Click here to see answer by josmiceli(19441)

Question 28536: I am having the worst time with mixture word problems. I am in College Algebra and this is my question.
---A chemist needs 170 milliliters of a 21% solution but has only 3% and 37% solutions available. Find how many milliliters of each that should be mixed to get the desired solution.
I used x= the 3% solution and y= the 37% solution.
I set it up as
I don't think that is right, but that is what I came up with. Thank you so much for your help.

Click here to see answer by Paul(988)

Question 28521: what is the meaning of ALGEBRA?
Click here to see answer by sdmmadam@yahoo.com(530)

Question 28569: PLEASE HELP ASAP: Ziggy's famous yogurt blends regular yogurt that is 3% fat with its no fat yogurt to obtain low fat yogurt that is 1% fat. How many pounds of regular and how many pounds of non-fat yogurt should be mixed to obtain 60 pounds of lowfat yogurt.
PLEASE HELP ASAP. thank you
Click here to see answer by venugopalramana(3286)

Question 28590: Phil has 30 ounces of a 60% sulfuric acid solution. How many ounces of 15% sulfuric acid solution should he add to obtain a solution that is 40% sulfuric acid?
Click here to see answer by Paul(988)

Question 28692: How much pure alcohol must a nurse add to 8cc of a 70% solution to strengthen it to a 90% solution? Just need to know if this is right and if not what is right.
.90(8)+ 0(x) = .70(x+8)
7.2 = .70x+5.6
1.6 = 70x
2.29c = x
Click here to see answer by venugopalramana(3286)

Question 28776: A pharmacist wishes to mix a solution that is 2% minoxidil. She has on hand 50 mL of a 1% solution, and she wishes to add some 4% solution to it to obtain the desired 2% solution. How much of the 4% solution should she add?
The equation that I got .5+.04(50+x)=.2(100+x)
I keep on getting a negative number.
Click here to see answer by Paul(988)

Question 28759: i have 2 questions I have been confused on
1) A pharmacist needs 500 milliliters of 20% phenobarbital solution but has only 5% and 25% phenobarbital solutions available. find how many milliliters of each he should mix to get the desired solution.

2) 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.
Click here to see answer by stanbon(75887)

Question 28884: jaime has available a 10% alcohol solution and a 60% alcohol solution. Find how many liters of each solution he should mix to make 50 liters of a 40% alcohol solution
Click here to see answer by stanbon(75887)

Question 29149: A Candy Barrel shop manager mixes M%M's worth $2.00 per pound with trail mix worth 1.50 per pound. Find how many pounds of each she would use to get 50 pounds of party mix worth $1.80.
Click here to see answer by Paul(988)

Question 29324: Joanne makes a mixture of dried fruits by mixing dried apples costing $6.00/kg and dried apricots costing $8.00/kg. How many kilograms of each are needed to make 20 kg of a mixture worth $7.20/kg?
Click here to see answer by Paul(988)

Question 29323: A spice mixture is 25% thyme. How many grams of thyme must be added to 12 g of the mixture to increase the thyme content to 40%?
Click here to see answer by Paul(988)

Question 29301: A chemist has 40mL of solution that is 50% acid. How much water should be added to make a solution that is 10% acid?
Click here to see answer by bmauger(101)

Question 29332: How many liters of water must be evaporated from 20 L of a 30% salt solution to produce a 50% solution?
Click here to see answer by Paul(988)

Question 29330: A chemist wishes to mix some pour acid with some water to peoduce 16 L of a solution that is 30% acid. How much pure acid and how much water should be mixed?
Click here to see answer by josmiceli(19441)

Question 29329: If you drive 2 h at 80 km/h, how fast must you drive during the next hour in order to have an average speed of 75 km/h?
Click here to see answer by longjonsilver(2297)

Question 29333: A securities broker advised a client to invest a total of $21,000 in bonds paying 12% interest and in certificates of deposit paying 5 1/4% interest. The annual income from these investiments was $2250. Find out how much was invested at each rate.
Click here to see answer by josmiceli(19441)

Question 29475: I've tried and tried to do this problem with no success so here it is:
A solution of gasoline and oil used for a gas powered weed trimmer is 8% oil. How much gasoline must be added to 3 gallons of this solution to obtain a new solution that is 5% oil? I set it up like this but I know this is wrong.
0.08X + 0.05(3+x)= 0.05(3) It comes up to 0
Click here to see answer by josmiceli(19441)

Question 29578: How much water should a chemist add to 16 ounces of a 25% sulfuric acid solution to reduce it to a 10% solution?
Click here to see answer by ikdeep(226)

Question 29805: Help!
A chemist needs a solution of tannic acid that is 70% pure. How much distilled water must she add to 5 gallons of acid which is 90% pure to obtain 70% solution?
Click here to see answer by longjonsilver(2297)

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