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Question 240531: How many millilitres of water much be added to 100mL of a 50% solution of sulphuric acid to make a 10% solution?
Click here to see answer by ankor@dixie-net.com(22740)

Question 241000: If a pharmacist needs 70L of a 50% alchohol solution but only has a 30% alchohol solution and a 80% alchohol solution how many L of each would make a 50% solution?
Click here to see answer by stanbon(75887)

Question 241085: If you have 200 ounces of 50% copper how many ounces of 20% copper would you add to get a 30% alloy?

Click here to see answer by nyc_function(2741)

Question 241109: Joseph has a 55% silver alloy. Ethan has a 75% silver alloy. They melted their alloys to create 160 grams of a 64% silver alloy. How many grams of each alloy?
Click here to see answer by ankor@dixie-net.com(22740)

Question 241134: To estimate the size of the bear
population on the Keweenaw Peninsula, conservationists
captured, tagged, and released 50 bears. One year later, a
random sample of 100 bears included only 2 tagged bears.
What is the conservationist�s estimate of the size of the
bear population?

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

Question 241234: Could someone please help me with this mixture problem? I have been pouring over it for two days (total of over 4 hours), and have tried various methods none of them yielding the correct answer.
A mechanic has 363 gallons of gasoline and 17 gallons of oil to make gas/oil mixtures. He wants one mixture to be 6% oil and the other mixture to be 2.5% oil. If he wants to use all of the gas and oil, how many gallons of gas and oil are in each of the resulting mixtures?
Click here to see answer by edjones(8007)

Question 241446: The manager of a bulk foods establishment sells a trail mix for $6 per pound and premium cashews for $12 per pound. The manager wishes to make a 135-pound trail mix-cashew mixture that will sell for $10 per pound. How many pounds of each should be used?
Click here to see answer by checkley77(12844)

Question 241532: how many gallons of a mixture containing 80% alcohol should be added to 6 gallons of a 25% solution togive 30% solution?
Click here to see answer by checkley77(12844)

Question 241690: A grocer wants to make a 20 lb mixture of chocolates and nuts worth $6.20/1b. Chocolate costs &4.80/lb and nuts cost $4.80/lb. How many pounds of each should she use?
Click here to see answer by checkley77(12844)

Question 241754: One canned juice drink is 25 percent orange juice and the other is 10 percent juice How many Liters of each should be mixed together in order to get 15Liters that is 17 percent orange juice?
Click here to see answer by checkley77(12844)

Question 242116: I need to know the method of finding the answer the following problem.
Jim can fill a pool carrying buckets of water in 30 minutes. Sue can do the same job in 45 minutes. Tony can do the same job in 1 1/2 hours. How quickly can all three fill the pool together?
Click here to see answer by checkley77(12844)

Question 242150: How many gallons of cream that is 30% butterfat must be mixed with milk that is 3% butterfat to make 45 gallons that are 12% butterfat?
cream X .30 .30x
milk X-45 .03 .03x -1.35
final solution 45 .12 5.40
.30x + .03x -1.35 = 5.40
.33x = 6.75
x=
this is as far as I can get that makes sense to me. Can you tell me where I am going wrong or what I do next?
Thank you.
Click here to see answer by Alan3354(69443)

Question 242256: A mixture contains five quarts of acid and water and is forty per cent acid.If the mixture is to be weakened to thirty per cent,how much water must be added?
Click here to see answer by nyc_function(2741)

Question 242341: how many liters of pure alcohol must be added to 5 liters of a 15% alcohol solution to make a 25% solution?

Click here to see answer by ptaylor(2198)

Question 242373: how many ounces of a 40% alcohol solution should be mixed with 60 ounces of a 70% alcohol solutionto produce a 60% alcohol solution?
Click here to see answer by Fombitz(32388)

Question 242411: Kimberly and Andrew use a metal alloy that is 27.32% copper to make jewelry. how many ounces of a 26% alloy must be mixed with a 29% alloy to form 75 ounces of the desired alloy?
I don't know how to set this one up.
Click here to see answer by ankor@dixie-net.com(22740)

Question 242462: 5.00g of octane are burned in a bomb calorimeter containing 2.00 * 10 ^2 g H2O. How much energy in calories, is released if the water temperature increases 6.00C?
Im stuck, I ondt know if I should set this problem up like this? I know the answer I just keep getting a totally wrong one. Someone please show me the steps they used?
Click here to see answer by scott8148(6628)

Question 242474: Ok, I need some help...Here we go: Mark is 10 years younger than Larry. Larry's age in 8 years will exceed twice Mark's age 3 years ago by 4 years. How old is each now?
Click here to see answer by stanbon(75887)

Question 242578: two more than twice billys age is 50. How old is billy?

Click here to see answer by hnckylie(3)

Question 242730: A pound of 5% iodine solution loses 3 ounces of diluting agent thru evaporation. What is the stength of the remaining solution?
Click here to see answer by Alan3354(69443)

Question 242727: Babbitt metal is an alloy made up of 90% tin, 7% antimony, 3% copper. How many pounds of pure copper must be added to 150 pounds of the alloy so that it will contain 17% copper?
Click here to see answer by solver91311(24713)

Question 242742: A goldsmith has two alloys that are different purities of gold. The first is three-fourths pure gold and the second is five twelfths pure gold. How many ounces of each should be melted and mixed in order to obtain a 6-oz mixture that is two-thirds pure gold?
Click here to see answer by checkley77(12844)

Question 242891: Jim has 5 pieces of string. He needs to choose the piece that will be able to go around his 36-inch waist. His belt broke, and his pants are falling down. The piece needs to be at least 4 inches longer than his waist so he can tie a knot in it, but it cannot be more that 6 inches longer so that the ends will not show from under his shirt. Which of the following pieces of string will work the best?

Click here to see answer by JimboP1977(311)

Question 242867: A container is partially filled with 12 liters of whole milk containing 4% butterfat. How much 1% milk must be added to get a mixture that is 2% butterfat? Construct a table, then solve.

Click here to see answer by nyc_function(2741)

Question 242864: An 80-pound grass seed mixture is 30% bluegrass seed. How many pounds of seed containing no bluegrass seed (0%) should be added to the seed mixture for a resulting blend that is 20% bluegrass seed? Construct a table, then solve
Click here to see answer by stanbon(75887)

Question 242596: A water tank has an inlet pipe and a drain pipe.
A full tank can be emptied in 30 minutes if the drain is opened and an empty tank can be filled in 45 minutes with the inlet pipe opened.
If both pipes are accidentally opened when the tank is full, then how long will it take to
empty the tank?

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

Question 243076: you own a bakery and have a special recipe that calls for a dough that starts with a 80% flour to 20% sugar mixture. An employee incorrectly mixed 15 pounds of the mixture at a 70% flour to 30% sugar ratio. How much flour must you add to the incorrect mixture so that the ratio of flour to sugar is corrected. How many pounds of the new mixture will there be.
Click here to see answer by stanbon(75887)

Question 243087: I just need help setting this up.
A chemist has one solution that is 20% saline and a second that is 65% saline. The chemist makes 120 gallons of a solution that is 50% saline by combining the two solutions.
How much of each solution is used in the mixture?

Click here to see answer by stanbon(75887)

Question 243145: A beaker contains a solution that is 15% alcohol. In another beaker is a solution that is 40% alcohol. How mcuh of each should be mixed to obtain 9 L of solution that is 25% alcohol?
Click here to see answer by checkley77(12844)

Question 243202: In the following figure, what is the area of the shaded circle inside of the square?
the figer is shaded circle inside squar and it touchs the sides of the aquare
Click here to see answer by nerdybill(7384)

Question 243371: OF a mixture containing 7 quarts, 5 quarts are alcohol. how many quarts of water must be added to produce a mixure containing 25%alcohol?
Click here to see answer by stanbon(75887)

Question 243338: a can of cranberry juice contains 25 fluid ounces. How many quarts of cranberry juice are in a case of 24 cans?
Click here to see answer by edjones(8007)

Question 243473: A goldsmith has two alloys that are different purities of gold. The first is three-fourths pure gold and the second is five-twelfths pure gold. How many ounces of each should be melted and mixed in order to obtain a 6-oz mixture that is two-thirds pure gold?
I am having problems with the fraction part... Hope you can help
Thanks
Lisa
Click here to see answer by stanbon(75887)

Question 243494: how much pure acid should be mixed with 9 gallons of a 50% acid solution in order to get an 80% acid solution
Click here to see answer by oberobic(2304)

Question 243760: How many gallons of milk that is 3 1/2% butterfat must be added to 80 gal of 1% butterfat milk to make milk that is 2% butterfat?
Click here to see answer by ankor@dixie-net.com(22740)

Question 243993: Suppose there are no taxes on the first $14000 of income and any income above $14000 is taxed at a 15% rate. A tax-law change is proposed that there should be no taxes on the first $16000 of income and the rate should be 17% on any income above $16000. People with which incomes will pay less under the proposed charges?
Click here to see answer by rfer(16322)

Question 244660: Kacie started on her bike at 15 miles per hour. Colleen left 2 and 1/2 hours later traveling at a rate of 25 miles per hour. How long did it take her to catch Kacie?
Click here to see answer by JimboP1977(311)

Question 244913: -78 is which term of an arithmetic sequence whose common difference is -4 and whose first term is 6?
Click here to see answer by stanbon(75887)

Question 244917: thrity bliters of 40% alchol solution is obtained by mixing 40% solution with a 70% solution. how many liters of each solution must be used to obtain the desired mixture?
Click here to see answer by stanbon(75887)

Question 244989: One antifreeze solution is 10% alcohol. Another antifreeze solution is 18% alcohol. How many liters of each antifreeze solution should be combined to create 20 liters of antifreeze solution that is 15% alcohol?
Click here to see answer by Theo(13342)

Question 245152: In a chemistry class, 5 liters of a 4%-saline 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 stanbon(75887)

Question 245174: A 40 mL solution is 80% acid. How much water
must be added to produce a solution that is 60%
acid?

Click here to see answer by stanbon(75887)

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