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Question 619276: A chemist has 400 milliliters of a solution that is half acid. She needs a solution that is 60% acid. How many millilters of acid should she add?
Click here to see answer by stanbon(57347)

Question 619387: Prepare 240 g of 4% sulfate ointment using a 2% ointment and a 3.5% ointment.
Prepare 180mg of tolnaftate 0.05% cream. In stock, you have 225 g each of tolnaftate 0.1% cream and tolnaftate cream 0.25%.

Click here to see answer by stanbon(57347)

Question 619509: A silversmith combined pure silver that cost $16.30 per ounce with 50 oz of a silver alloy that cost $15.00 per ounce. How many ounces of pure silver were used to make an alloy of silver costing $15.80 per ounce?

Click here to see answer by richwmiller(9135)

Question 619566: A solution containing 30% acid is mixed with a solution containing 10% acid to make 2000 liters of a solution containing 15% acid. How much of the 30% solution was used?
Click here to see answer by Alan3354(30993)

Question 619791: 3.
How many kilograms of pure salt must be added to 7 kg of a 30% salt solution in order to produce a 60% solution? Remember that pure salt is a 100% solution of salt. Round your answer to the nearest tenth.
I used the equation (%1)(A1)+(%2)(A2) = (%M)(A1)
I keep getting the wrong answers
Click here to see answer by ewatrrr(10682)

Question 619793: 4.
How many milliliters of water must be added to 12 ml of a 60% salt solution in order to produce a 42% salt solution? Round your answer to the nearest tenth.
Click here to see answer by ewatrrr(10682)

Question 619854: If I have a .5% solution how much water do I have to add to make it a .03% solution?
Click here to see answer by josmiceli(9678)

Question 619794: 5.
How many pounds of an $83 per pound substance must be mixed with an $11 per pound substance to get 240 lbs of an alloy which will cost $28 per pound? Round to the nearest pound.
Click here to see answer by Alan3354(30993)

Question 619949: If you mixed a $0.49 lb. of candy with a $0.65 lb. of candy, what will be the new price of new mixture of candy?
Click here to see answer by stanbon(57347)

Question 619960: how many liters each of a 65% acid solution and a 30% acid solution must be used to make 70 liters of a 60% acid solution?
Click here to see answer by dragonwalker(72)

Question 619984: How many pounds of gourmet candy selling for $1.40 per pound should be mixed with 4 pounds of candy selling for $2.40 per pound to obtain a mixture selling for $1.80 per pound?
Click here to see answer by Maths68(1474)

Question 620060: how many grams of pure silver must a silversmith mix with a 45% silver alloy to produce 200 grams of a 50% alloy?
I just want so help setting the promblem up.
Click here to see answer by ankor@dixie-net.com(15652)

Question 620188: If I have a 80ml solution that is 20% acid by volume, how many mL should I remove and replace with pure 100% acid to obtain a final solution of 80ml that is 40% acid by volume? What is the equation?
Click here to see answer by stanbon(57347)

Question 620192: How many gallons of an 80% antifreeze solution must be mixed with 100 gallons of 30% antifreeze to get a mixture that is 70% antifreeze?
Click here to see answer by fcabanski(874)

Question 620196: How many 550 milliliter Are there in 1.65 liters?

Click here to see answer by richard1234(5390)

Question 620196: How many 550 milliliter Are there in 1.65 liters?

Click here to see answer by fcabanski(874)

Question 620220: We need 1/2 gallon of gas to travel 1 1/8 miles to reach our destination. How many gallons of gas would we need to travel 3 1/2 miles.

Click here to see answer by ewatrrr(10682)

Question 620394: I need the answer and the working of this word equation: A student pays 70% of the adult price for a movie ticket. If an adult pays $15 on weekends, how much is th student's weekend movie ticket?
Click here to see answer by nerdybill(6958)

Question 620537: Find how many quarts of 6% butterfat milk and 3% butterfat milk should be missed to yield 60 quarts of 5% butterfat milk.
Click here to see answer by Alan3354(30993)

Question 620608: hi
Have a medicine that comes as a solution: 3% Aethoxysklerol medicine in 2ml.
Wish to have a concentration of 0.6% Aethoxysklerol.
How much saline would I need to add to the 2ml of 3% to get 0.6% concentration ??
Many thanks
Click here to see answer by stanbon(57347)

Question 620657: Find how many quarts of 6% butterfat milk and 3% butterfat milk should be mixed to yield 60 quarts of 5% butterfat milk.
Click here to see answer by Alan3354(30993)

Question 620824: How many liters of water should be used to dilute a 100 % of 240 liters liquid to obtain a 75 % solution ?
Click here to see answer by ewatrrr(10682)

Question 620932: For every 100 customers that came in the store 75 bought milk. If only 20 came in the store yesterday how many bought milk

Click here to see answer by math-vortex(472)

Question 621163: How many liters of 50% acid must be mixed with 20% acid to get 10 liters of a 30% mixture?
Click here to see answer by Alan3354(30993)

Question 621229: mom made 2 batches of iced tea. 1st batch was 6% sugar and was too sweet, the 2nd batch was 3% sugar and was not sweet enough. how many cups should she take from each batch to make 9 cups of iced tea containing 4% sugar?
Click here to see answer by josmiceli(9678)

Question 621350: 1) In a chemistry class, 8 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 jsmallt9(3296)

Question 621355: How many grams of an alloy that is 70% gold should be melted with 20 grams of an alloy that is 10% gold to produce an alloy that is 60% gold ?
Click here to see answer by jsmallt9(3296)

Question 621442: A 3-gallon mixture contains one part S and two parts R. In order to change it to a mixture
containing 25% S, how much R should be added?
Click here to see answer by ankor@dixie-net.com(15652)

Question 621574: On two investments totaling $6,000, Peter lost 6% on one and earned 9% on the other. If his net annaul receipts were $327, how much was each investment?
Click here to see answer by josmiceli(9678)

Question 621625: A dairy needs 246 gallons of milk containing 5% butterfat. How many gallons each of milk containing 6% butterfat and milk containing 3% butterfat must be used to obtain the desired 246 gallons?
Click here to see answer by ptaylor(2048)

Question 621757: An urban renewal project involves reseeding a park that is in the shape of a square 60 feet on each side . Each bag of grass seed costs $9.75 and will seed 1200 ft.2. How much money should be budgeted for buying grass seed for the park?
Click here to see answer by ewatrrr(10682)

Question 621800: factor completely
a^4-b^4
Click here to see answer by Alan3354(30993)

Question 621794: A dairy needs 260 gallons of milk containing 7% butterfat. How many gallons each of milk containing 8% butterfat and milk containing 4% butterfat must be used to obtain the desired 260 gallons?
Click here to see answer by josmiceli(9678)

Question 621888: How many L of a 50% sugar solution must be mixed with 6.6 L of a 80% sugar solution to make a 61% solution?
Click here to see answer by Maths68(1474)

Question 622245: How much 10% acid solution should be mixed with 1 liter of 25% acid solution to produce a solution that is 15 % acid? need help with the formula a formula that I can plug these numbers into
Click here to see answer by Alan3354(30993)

Question 622266: Two people leave their homes at 11:30 am and between the two of them, they drive a total of 37.5 miles. one drives an average of 15mph faster then the other . they meet at noon find the average driving speed for each?
d=rt
d=37.5
t=30 min
let x =rate
x(15) + x * 30 min = 37.5
16x * 30 min = 37.5
I don't know if I am on the right track but I don't know where to go from here
Please help with a formula
Click here to see answer by josmiceli(9678)

Question 622326: an investor bought 400 shares of stock, some at $4.50 per share and some at $7.50 per share. If the total cost was $2,100.00, how many shares of each stock did the investor buy?
Click here to see answer by babs1010(6)

Question 622371: How much water should be added to 50 ml of 25% acid solution to dilute it to 10% acid solution
Click here to see answer by nerdybill(6958)

Question 622443: who am i?a)i am 6 digit number.
b)my sum is 43
c)i come below 5,00,000
Click here to see answer by Alan3354(30993)

Question 622579: Suppose that x liters of 31% acid solution are mixed with y liters of a 42% solution to obtain 100 L oF 36% solution. WHat equations solve this problem?
Click here to see answer by josmiceli(9678)

Question 622586: Juice-O-Rama is a refreshment stand specializing in a fruit drink mixture of orange juice and prune juice. The orange juice costs $1.20 per liter and the prune juice costs $1.40 per liter. If they need 8 liters of the final drink at a cost of $1.24 per liter, how many liters of each juice will they need to make their specialty drink?
This is the work i've done, i need help.
x=the number of liters of orange juice
y=the number of liters of prune juice
x+y=8
1.20x+1.40y=1.24
20(8-y)+1.40y=1.24
1.20(9.4)=1.24
Click here to see answer by josmiceli(9678)

Question 622608: i am 6 .digit number.
my sum is 43
i come below 5,00,000
Click here to see answer by Alan3354(30993)

Question 622587: A solution containing 45% water is mixed with another solution containing 10% bromine. If the chemist needs 30 liters of the mixture, how many liters of each solution are needed to make a 34.5% water/bromine solution?

Click here to see answer by ankor@dixie-net.com(15652)

Question 622716: what is 14% out of 55
Click here to see answer by lynnlo(4164)

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