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Question 229376: in a chemistry class, 6 liters of 4% silver iodide solution must be mixed with a 10% solution to get a 6% solution. how many liters of the 10% solution are needed?
Click here to see answer by ankor@dixie-net.com(22740)

Question 230075: How many liters of a 20% alcohol solution must be miced with 50 liters of a 70% solution to get a 50 % solution?
I can solve this just by using the equation of .20x + 35 = .50(50+x)
But this has to be done in a system of equations. I am stumped on how to get the 2nd equation. There is no usual x+y = a certain total amount here.
Not looking for the answer but just the 2nd. equation
Thanks in advance :0)
Click here to see answer by josmiceli(19441)

Question 230589: An environmental group estimates that the amount of pollution in a pond will decrease by 10% each month. To determine the concentration C, of pollutants (in parts per million) after (m) months, the group uses the function C(m)=23(0.95)^m
.
(1) to the nearest tenth, what will be the concentration of pollutants in the pond in 5 years?
(2) What was the initial concentration of pollutants in the pond?
Click here to see answer by nerdybill(7384)

Question 230436: if seven can mix 20 drinks in 5 minutes,sue can mix 20 drinks in 10 minutes, jack can mix 20 drinks in 15 minutes,how much time will it take all 3 of them working togehter to mix 20 drinks?
Click here to see answer by Alan3354(69443)

Question 230402: Can you please help me solve this? A chemist wants to mix distilled water with a 75% solution of sulfuric acid to produce a 60% solution. If 3 gallons of distilled water is used, how much of 75% is needed?
Click here to see answer by ankor@dixie-net.com(22740)

Question 230649: C and Y candy company mixes candy that costs $6.00 per kg with candy that costs $4.50 per kg. How many kg's of each are needed to make a 3kg box that costs $15.00 ?
Click here to see answer by checkley77(12844)

Question 230923: With water from one hose, a swimming pool can be filled in 9 hours. A second, larger hose used alone can fill the pool in 4 hours. How long would it take to fill the pool if both hoses were used simultaneously?
Click here to see answer by checkley77(12844)

Question 230945: FIND HOW MANY QUARTS OF 6% BUTTERFAT MILK AND 2% BUTTERFAT MILK SHOULD BE MIXED TOGETHER TO YEILD 80 QUARTS OF 5% BUTTERFAT MILK? please help asap
Click here to see answer by josmiceli(19441)

Question 231140: PLease help me solve; If the width of a rectangle is 1 inch less than its length and the diagonal is 1 inch longer than its length, find the length and the width. I know w=l-1 and D=l+1 but I dont know how to fill in the blanks to solve the problem
Click here to see answer by checkley77(12844)

Question 231224: A person wants to make a one ounce ring composed of Gold and Silver. One ounce of gold cost $600 and one ounce of silver cost $50. How much of each metal should be used if the cost is $200
Click here to see answer by stanbon(75887)

Question 231209: Engine failure forced Robbin to Pilot be Cessna 150 to an emergency landing. To land, Robbins plane glided 17,000 ft over a 15,000-ft stretch of deserted highway. From what altitude did the decent begin?

Thank you
Click here to see answer by checkley77(12844)

Question 231414: A chemical storeroom has an 80% alcohol solution and a 30% alcohol solution. How many milliliters of each should be used to obtain 50 milliliters of a 60% solution.
Click here to see answer by rapaljer(4671)

Question 231530: If I have one gallon of product wih an active ingredient of 5% and would like to dilute the product with water to make a solution with .75% active ingredient, how many gallons of water would I need to add?
Click here to see answer by Alan3354(69443)

Question 231715: a pharmacist has 20% solution of phenol and a 60% phenol solution. how much of each solution should be mixed together to form 800 milliliters of a 47.5% solution?
Click here to see answer by checkley77(12844)

Question 231931: I have been working on this problem all night please help?
How many liters of a 20% salt solution must be mixed with 30 liters of an 60% salt solution to obtain a 30% salt solution?
Click here to see answer by ankor@dixie-net.com(22740)

Question 231929: A solution containing 30% alcohol is to be mixed with a solution containing 50%
alcohol to make 200 L of a solution containing 42% alcohol. How much of the 50%
solution should be used?
Click here to see answer by stanbon(75887)

Question 231932: I have so many problems with word problems and I really don't know how to set up the problem please help.
Jose invested a certain amonunt of money at 8% interest and $300 more than that amount at 11%. His total yearly interest was $69.10. How much did he invest at the 8% rate?
Click here to see answer by checkley77(12844)

Question 232133: calvin invested $7500 for one year, part at 12% annual interest and the rest at 10% annual interest. His total for the year was $890. How much money did he invested at 12%?
Click here to see answer by Earlsdon(6294)

Question 232224: I have two gallons of grape drink that is one-third water, and I mix it with three gallons of lemonade that is three-fourths water. After mixing, I spill one gallon of the mixture. How much water is there in the remaining four gallons of the mixture?
Click here to see answer by stanbon(75887)

Question 232286: a chemist needs a 30% iron alloy. How many grams of a 70% iron alloy must be mixed with 16 grams of a 20% iron alloy to obtain the required 30% alloy
Click here to see answer by stanbon(75887)

Question 232371: How many liters of pure acid must be added to 3 liters of a 50% acid solution to obtain a 75% acid solution?
Click here to see answer by ptaylor(2198)

Question 232491: A silversmith mixed 25g of a 70% silver alloy with 50g of a 15% silver alloy. What is the percentage concentration of the resulting alloy?
Click here to see answer by Alan3354(69443)

Question 232610: A photographer wishes to mix 2 liters of a 5% acetic acid solution with a 10% solution to get a 7% solution. How many liters of the 10% solution must be added?
Thanks so much for your help!
Click here to see answer by checkley77(12844)

Question 232625: One grade of tea worth $3.20 a pound is to be mixed with another grade worth $2 per pound to make 20 pounds that will sell for $2.72 per pound. How much of each grade of tea must be used?
Thanks a ton!!!
Click here to see answer by stanbon(75887)

Question 232615: Coffee that sells for $3.60/kg is mixed with coffee that sells for $2.40/kg to make 1200 kg of coffee that will sell for $2.80/kg. How many kilograms of each type of coffee was used?
Click here to see answer by checkley77(12844)

Question 232738: You have a solution that is 50% alcohol and a solution that is 80% alcohol. How much of each do you need to mix to get 3 gallons of a solution that is 60% alcohol?
Click here to see answer by nerdybill(7384)

Question 232849: How much brand A coffee costing 3.95 per pound should be mixed with 25 pounds of brand b coffee worth 3.60 per pound in order to obtain a mixture worth 3.70 per pound?
Click here to see answer by RAY100(1637)

Question 232862: a motel charges 80.00 per day for double occupancy and 70.00 per day for single occupancy. If 80 rooms are occupied one night for a total of 5800.00 how many rooms of each kind are occupied?
Click here to see answer by rfer(16322)

Question 232904: how many liters of a 15 percent salt solution must be added to 2 liters of 30 percent to make a mixture of 18 percent salt solution?
Click here to see answer by checkley77(12844)

Question 232695: A metallurgist needs to make 12.4 lb. of an alloy containing 50% gold. He is going to melt and combine one metal that is 60% gold with another metal that is 40% gold. How much of each should he use?
Click here to see answer by ankor@dixie-net.com(22740)

Question 233091: I have 10% of homemade salsa that is 25% jalapenos. I buy some store salsa that is 4% and mix the two salsa together. how much store salsa do i need in order to have a mixture that is 10% jalapenos?
Click here to see answer by stanbon(75887)

Question 233242: the sum of two numbers is 129 and their difference is 61. what are the two numbers?
Click here to see answer by mando271(42)

Question 233344: How much water should be added to 64 ounces of 10% salt solution to make a 2% salt solution?
Click here to see answer by stanbon(75887)

Question 233472: a store sells mixtures of peanuts and almonds for 4.50lb,peanuts sell for 2.95per pound almonds sell for 5.95 per pound how many pounds of each should be used to make 90 pounds of this mixture
Click here to see answer by checkley77(12844)

Question 233641: How much 30% solution need to be combined to make 80 ml of a 60 % solution?
Click here to see answer by Alan3354(69443)

Question 233645: How much 30% solution and 70% solution need to be combined to make 80 ml of a 60% solution?
Click here to see answer by stanbon(75887)

Question 233645: How much 30% solution and 70% solution need to be combined to make 80 ml of a 60% solution?
Click here to see answer by nerdybill(7384)

Question 234152: the larger of two numbers is 5 less than twice the smaller number. the sum of the two numbers is 28. what are the numbers?
Click here to see answer by nyc_function(2741)

Question 234281: 5025/.9975
Click here to see answer by rfer(16322)

Question 234293: How much of the solutions do I need to use when one container has 40% and another has 100% and 50% is needed for one gallon?I came up with a huge number.
Click here to see answer by stanbon(75887)

Question 234550: If x ml of water are added to 200 ml of pure orange (concentrate) the result is a mixture that is 80% orange juice (concentrate) and the rest water, what equations could be used to solve for x?
Please help me solve the problem too.
Click here to see answer by solver91311(24713)

Question 234719: gift wrap @ $4 solids+$6 prints =total number of rolls480 and total dollar amount = $2340 How many rolls of each sold?
Click here to see answer by solver91311(24713)

Question 234753: how many gallons of a 70% acid solution must be mixed with 30 gallons of a 24% solution to obtain a solution that is 60% acid?
Click here to see answer by checkley77(12844)

Question 234801: PURCHASE 50 STAMPS. SOME STAMPS .22 EACH. THE REST .14 EACH TOTAL SPENT IS 10.04

Click here to see answer by checkley77(12844)

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