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Question 658866: Write a quadratic equation having given the solution of: -8, -5
Click here to see answer by MathLover1(20850)

Question 658888: A tank holds 140 liters of checmical solution. Currently the solution has a strength of 60%. How much of this should be drained and replaced with 100% solution to get a final strength of 80%?
Click here to see answer by josmiceli(19441)

Question 658959: Suppose that you have a supply of a 40% solution of alcohol and a 60% solution of alcohol. How many quarts of each should be mixed to produce 90 quarts that is 50% alcohol?

Click here to see answer by josmiceli(19441)

Question 658931: When you mixed salt with water did you create a solution? Did you create a mixture? Explain.
Click here to see answer by Alan3354(69443)

Question 658991: Determine how much pure water would have to be mixed with 60ml of 80% sulfuric acid to create a 50% solution of sulfuric acid solution?
Click here to see answer by Alan3354(69443)

Question 659032: $27,090 is invested, part at 13% and the rest at 10%. If the interest earned from the amount invested at 13% exceeds the interest earned from the amount invested at 10% by $440.16, how much is invested at each rate? (Round to two decimal places if necessary.
I've tried to work out this problem 2 different ways! Still, I have no luck. Please Help!
Click here to see answer by Theo(13342)

Question 659110: how many liters of water must be added to 20 liters of a 7% antifreeze solution to produce a 50% acid solution
Click here to see answer by Alan3354(69443)

Question 659110: how many liters of water must be added to 20 liters of a 7% antifreeze solution to produce a 50% acid solution
Click here to see answer by stanbon(75887)

Question 659207: if 15% is 200.00 then how much is 85%?
Click here to see answer by colliefan(242)

Question 659207: if 15% is 200.00 then how much is 85%?
Click here to see answer by Alan3354(69443)

Question 659295: How much water should be added to 1 gallon of pure antifreeze to obtain a solution that is 90% antifreeze?
Click here to see answer by josmiceli(19441)

Question 659391: A 10g 15% gold alloy is mixed with a 20g 5% gold alloy. What is the ercent concentration of the resulting alloy?
Click here to see answer by Alan3354(69443)

Question 659535: Hello,
Question: The radiator in a certain make of a car needs to contain 40 liters of 40% antifreeze. The radiator now contains 40 liters of 20% antifreeze. How many liters of this solution must be drained and replaced with 100% antifreeze to get the desired strength?
I have tried creating a table like my teacher suggested and am having a difficult time with that method. I know that my goal is to set up a system of equations but I never know where to place the variables and which number corresponds to that variable.
Thanks,
Katie
Click here to see answer by MathLover1(20850)

Question 659740: If a two digit number has x for its unit's digit and y for its ten's digit, represent the number.
Click here to see answer by ReadingBoosters(3246)

Question 659965: a car and a bus set out at 3P.M. from the same point headed in the same direction. the average speed of the car is twice the average speed of the bus. In 2 h the car is 68 mi ahead of the bus. Find the rate of the car.
Click here to see answer by solver91311(24713)

Question 659964: a car and a bus set out at 3P.M. from the same point headed in the same direction. the average speed of the car is twice the average speed of the bus. In 2 h the car is 68 mi ahead of the bus. Find the rate of the car.
Click here to see answer by solver91311(24713)

Question 660106: A chemist is trying to make 30 gallons of a 42 percent solution. He only has a 50 percent and a 60 percent solution. How much of each are needed?
Click here to see answer by Alan3354(69443)

Question 660303: jessica plans to make a fruit juice blend using the two juices at the right. she wants to sell the mixture for an amount between $1.40 and $1.45 per liter
Click here to see answer by lynnlo(4176)

Question 660358: You're mixing blue paint with yellow paint to get a total of 12 gallons of the mixture. You want to use 7 times as much yellow paint as blue paint. How many gallons of each should you use?
Click here to see answer by ReadingBoosters(3246)

Question 660745: how many grams of sugar must be added to 60 grams of a solution that is 32% sugar to obtain a solution that is 50% sugar
Click here to see answer by stanbon(75887)

Question 660804: please help me solve this problem. A chemist has two solutions of HNO3. One has 40% concentration and the other has 25% concentration. How many liters of each solution must be mixed to ob tain 57 liters of a 26% solution?
Click here to see answer by josmiceli(19441)

Question 661126: A set of marbles can be divided in equal shares among 2, 3, 4, 5, or 6 children with no marbles left over. What is the least number of marbles that the set could have?

Click here to see answer by ewatrrr(24785)

Question 661158: Is 4 liters more then 40 milliliters

Click here to see answer by MathLover1(20850)

Question 661140: if a nurse needs two liter of a 4% solution of a certain medication, and she only has a 2% solution and a 10% solution to work with, how much of each should she mix together to get what she needs?
Click here to see answer by Theo(13342)

Question 661367: A nurse has 1 liter of a solution that is 10% alcohol. How much pure alcohol must she add to bring it to a solution that contains 25% alcohol? (Hint: A pure alcohol solution contains 100% alcohol)
Click here to see answer by josmiceli(19441)

Question 661405: 10+.15x>50+.05x
Click here to see answer by ReadingBoosters(3246)

Question 661499: A solution containing 30% chicken broth is to be
mixed with a solution containing 50% chicken broth
to make 200L containing 42% chicken broth. How
much of each solution should be mixed
Click here to see answer by stanbon(75887)

Question 661539: A tank holds 95 liters of a chemical solution. Currently, the solution has a strength of 20%. How much of this should be drained and replaced with a 65% solution to get a final strength of 50%? Could you write the original equation also.
Click here to see answer by lwsshak3(11628)

Question 661483: there are 12 liters of 60% acid solution. How much must be drained and replaced with pure acid to get a final strength of 75%?
Click here to see answer by lwsshak3(11628)

Question 661944: ? is 4 times as many as 10.
Click here to see answer by ReadingBoosters(3246)

Question 661946: How many ml of a 34% saline solution must be mixed with pure water to make
17 ml of a 12% saline solution?

Click here to see answer by josmiceli(19441)

Question 662020: A radiator contains 8 quarts of fluid, 20% of which is antifreeze. How much fluid should be drained and replaced with pure antifreeze so that the new mixture is 25% antifreeze? (Round your answer to two decimal places.)
Click here to see answer by josmiceli(19441)

Question 662112: Five grams of sugar are added to a 70-gram serving of a breakfast cereal that is 10% sugar. What is the percent concentration of sugar in the resulting mixture?
Click here to see answer by lwsshak3(11628)

Question 662169: i need to add a half of cup of solution for two and a half gallons of water?
Click here to see answer by Alan3354(69443)

Question 662223: Ok, these inequality problems are confusing me. Can anyone please help?
You are travelling by train. You are allowed two carryon bags, each with a max. weight of 50 lbs. One weighs 12 and one 21 pounds.
Write and solve an inequality that represents the weight W (in pounds) of personal belongings you can add to the first bad without exceeding the weight limit.
Click here to see answer by stanbon(75887)

Question 662267: A radiator contains 15 quarts of fluid, 30% of which is antifreeze. How much fluid should be drained and replaced with pure antifreeze so that the new mixture is 55% antifreeze?
Click here to see answer by ewatrrr(24785)

Question 662306: A radiator contains 5 quarts of fluid, 30% of which is antifreeze. How much fluid should be drained and replaced with pure antifreeze so that the new mixture is 60% antifreeze? (Round your answer to two decimal places.)
Click here to see answer by josmiceli(19441)

Question 662372: 1. I am thinking of a number.If you add 10 to it and divide the sum by 5, you get 7. What number am i thinking of?

2. Divide my number by 5 and add 10 to the quotient.You get 15, what is my number?
3. If I divide my number of marbles among Miles, Mel and Rosie, each of them get 30 marbles.How many marbles do I have?
4. In the morning 15 cars parked in the basement of the building,At noontime,the number of cars
was doubled and then, at 4:00pm, 7 more cars wee parked.At 6:00pm,, 8 cars went out.How many cars were then still parked?
5. Add 12 to the number that I am thinking of. Then divide the sum by 3 and then, multiply the quotient by 5.Subtract 15 from the product you get 20.What number am I thinking of?
6. Milo, Ken and Vernon are car washers. Milo washed one-half of all the cars
that time. Ken washed one-forth of he remaining cars, and Vernon washed the rest. If Vernon washed 15 cars, how many cars did the three people wash?
7. Helen went to a store and spent half of her money plus 15 pesos more. She went to a second store and spent half of her remaining money plus 15 pesos more. Then she had exactly 75 pesos left. How much did she have at the beginning>
8. Mr. Ablir operates the elevator in a school building. He took Mr. Espe up 6 floors from the floor on which Mr Espe had his class. Then Mr. Ablir went down 9 floors to the first floor lobby. What is the number of the floor on which Mr. Espe had his class?

Click here to see answer by ReadingBoosters(3246)

Question 662341: When testing one�s blood glucose level, they must prick their finger with a lancet to acquire a drop of blood. New glucometers require less blood than older models, allowing other areas of the body to be used instead of the fingers. What are these sights and how have these alternate sights made customers more comfortable and compliant with testing their blood?
Click here to see answer by KMST(5328)

Question 662414: a chemist has 300 grams of 20% hydrochloric acid solution. he wishes to drain some off and replace with an 80% solution so as to obtain a 25% solution. How many grams must he drain and replace with the 80% solution?
Click here to see answer by ankor@dixie-net.com(22740)

Question 662482: How do I dilute a 50% solution to a 25% solution
Click here to see answer by Alan3354(69443)

Question 662482: How do I dilute a 50% solution to a 25% solution
Click here to see answer by josmiceli(19441)

Question 662527: A chemist needs 7 liters of a 50% salt solution. All she has is a 20% salt solution and a 70% salt solution. How much of each of the two solutions should she mix to obtain her desired solution?
Click here to see answer by josmiceli(19441)

Question 662563: How much water must be added to a 20 quarts of a 12% alcohol solution to dilute it to a 9% solution?
Click here to see answer by stanbon(75887)

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