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Question 145344: The average age of the two Jones children is 5. The average of the three Smith children is 15. The average age of the five children together is?
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Question 145688: A disc jockey must play 14 commercial spots during 1 hour of a radio show. Each commercial is either 30 seconds or 60 seconds long. If the total commercial time during 1 hours 11 minutes, how many 30-second commericals were played that hours? How many 60-second commercials?
Click here to see answer by stanbon(75887)

Question 145687: Snookers Lumber can convert logs into either lumber or plywood. In a given day, the mill turns out twice as many units of plywood as lumber. It makes a profit of $30 on a unit of lumber and $40 on a unit of plywood. How many of each unit must be produced and sold in order to make a profit of $11330?
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Question 145686: The Everton College store paid $1966 for an order of 52 calculators. The store paid $8 for each scientific calculator. The others, all graphing calculators, cost the store $58 each. How many of each type of calculator was ordered? The store order _____ scientific calculators and _____ graphing calculators.
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Question 145685: Soybean meal is 12% protein; cornmeal is 6% protein. How many pounds of each should be mixed together in order to get 240-lb mixture that is 9% protein? How many pounds of the cornmeal should be in the mixture? How many pounds of the soybean meal should be in the mixture?

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

Question 146027: Sarah wants to mix 400 liters of a solution that is 57.5% iodine. She has two solutions availiable. One is 20% and the other is 70% iodine. How many of each should Sarah use?
Click here to see answer by ptaylor(2198)

Question 146102: a number is 7 less than another, if 4 times the smaaler number plus twice the larger is 46. find the two numbers?
Click here to see answer by nerdybill(7384)

Question 146154: The cooling system of a certain foreigh-made car has a capacity of 15 liters. If the system is filled with a mixture that is 40% antifreeze, how much of this mixture should be drained and replaced by pure antifreeze so that the system is filled with a solution that is 60% antifreeze?
Click here to see answer by nerdybill(7384)

Question 146156: A chemist has one solution that is 25% salt and 75% water, and another solution that is 10% salt. How many liters of each sould the chemist use to make 120 liters of a solution that is 15% salt?
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Question 146201: how much antifeeze should be added to 300 gallons of 30% antifreeze solution to raise the antifreeze solution to 40%?
Click here to see answer by ptaylor(2198)

Question 146391: The Good Seed Flower Shop sells its own brand of fertilizer. It mixes one brand of fertilizer that contains 7% nitrogen with another than contains 8% nitrogen. The resulting mixture contains 7.7% nitrogen. How many pounds of the 7% fertilizer must be used to make 400 pounds of the 7.7% mixture?
Click here to see answer by checkley77(12844)

Question 146502: a container contained 500 ml of a solution that was 52% water. how much water should be removed from the solution so that the remainder is 40% water?
Click here to see answer by ishan sethi(3)

Question 146666: I would appreciate assistance with this word problem, thanks!
A chemist has three different acid solutions. The first acid solution contains 20% acid, the second contains 40%, and the third contains 60%. He wants to use all three solutions to obtain a mixture of 60 liters containing 50% acid, using twice as much of the 60% solution as the 40% solution. How many liters of each solution should be used.
Click here to see answer by scott8148(6628)

Question 146696: Lynn and Laws knew that the confection should be exactly 8% sugar. It was to be made using one component that was 5% sugar and another that was 20% sugar. How much of each should they use to get 800 ml of the confection?
Click here to see answer by Nate(3500)

Question 146767: Soybean meal is 18% protein and cornmeal is 9% protein. How many pounds of each mixture should be mixed together in order to get 360lb mixture that is 12% protein?
Click here to see answer by jim_thompson5910(35256)

Question 146771: what is the slope of x=-6?
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Question 146773: x+7y=4 (1)
x=8-7y (2)
What is the solution of the system?
Click here to see answer by jim_thompson5910(35256)

Question 146833: a barrel contains 30 gallons of 40% antifreeze. how many gallons of an 80% antifreeze solution should be added to make the barrel contain 50% antifreeze?
Click here to see answer by ptaylor(2198)

Question 146843: A restaurant chef mixes 20 lb. of snow peas costing $1.99 a pound with 14 lb. of petite onions costing $1.19 a pound to make a vegetable medley for the evening meal. Find the cost per pound of the mixture. (You must show alg. to receive full credit)
Click here to see answer by checkley77(12844)

Question 146842: How many pounds of 20% copper alloy must be mixed with 600 lb. of a 30% copper alloy to make a 27.5% copper alloy? (must show alg)

Click here to see answer by checkley77(12844)

Question 147007: 5 fl. oz. of a 2% alcohol was mixed with 11 fl. oz. of a 66% alcohol solution. Find the concentration of a new mixture.
Click here to see answer by Fombitz(32388)

Question 147292: A chemist needs to mix 20 liters of 40% salt solution with some 70% solution to get a mixture that is 50% salt. How many liters of 70% solution should be used?
Click here to see answer by josmiceli(19441)

Question 147291: How many gallons of 50% antifreeze must be mixed with 80 gallons of 20% antifreeze to get a mixture that is 40% antifreeze?
Click here to see answer by josmiceli(19441)

Question 147290: A tank holds 80 gallons of chemical solution. Currently the solution has a strength of 30%. How much of this should be drained and replaced with a 70% solution to get a final strength of 40%?
Click here to see answer by josmiceli(19441)

Question 147450: If grade A coffee costs .95 cents a pound and grade b coffee costs .75 cents a pound, how many pounds of each grade is needed if the total cost is $50.50, and the amount of grade b that is needed is twice the amount needed for grad A plus 5 pounds?
Click here to see answer by ankor@dixie-net.com(22740)

Question 147541: 300 liters of a 76% antifreeze solution had to be reduced to a 20% solution. How many liters of antifreeze should be extracted?
Click here to see answer by jojo14344(1513)

Question 147618: eighty liters of a 40% antifreeze solution had to be strengthened so it contained 52% antifreeze. how much should be added?
Click here to see answer by Nate(3500)

Question 147638: A computer store has 10 copies of a word processing program, 12 copies of a spread sheet program, and 8 copies of a draw program. Three of the word processing, four of the spread sheet and two of the draw programs are infected with a computer virus. If a program is selected at random, the probability it is infected with a virus is:
Click here to see answer by edjones(8007)

Question 148043: please help me solve this problem,
Ten gallons of a 30% acid solution is obtained by mixing a 20% solution with a 50% solution. How much of each must be used?
Click here to see answer by scott8148(6628)

Question 148075: The manual for your vehicle suggests that you use gasoline that is 89 octane. In order to save some money, you decide to use some 87 octane and some 93 octane in combination with the 89 octane currently in your tank in order to have an approximate 89 octane mixture. Assuming that you have one gallon of 89 octane remaining in your tank (our tank capacity is 16 gallons), how many gallons of 87 and 93 octane should be used to fill up your tank to achieve a mixture of 89 octane? In other words, how many gallons of 87 octane and 93 octane should be used to get 15 gallons of octane (why 15? 16 gallon capacity in tank and one gallon is already in there of 89 octane. You must find the solutions by both the process of substitution and by the process of elimination. Demonstrate both approaches.
Click here to see answer by stanbon(75887)

Question 148227: At 55 km/h, how far can you travel in 4.5 h? Use unit analysis to check your answer.
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Question 148230: The Fahrenheit and Celsius scales are related by the equation F= 9/5 C+32. What temperature Celcius would give the body temperature of 98.6 degrees F?
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Question 148228: A box contains 5 green, 2 yellow, and 3 purple balls. Find the probability of obtaining a green or a yellow or a purple ball in a single draw.
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Question 148225: A 5% acid solution is mixed with a 9% acid solution. How many ounces of the 5% acid solution must you mix with the 10 ounces of 9% acid solution to obtain 40ounces of 6%acid solution?
Click here to see answer by stanbon(75887)

Question 148233: a chemist has two large containers of sulfuric acid solution. each has a different concentration of acid. Blending 300mls of the first solution (25% acid solution) with a currently unknown amount of the second solution (10% acid solution) gives a mixture that is 15% acid. How much of the second solution was mixed in and how much was in the final mixture? You must find the solutions by substitution and the process of elimination. Demonstrate both approaches in your work.
Click here to see answer by ankor@dixie-net.com(22740)

Question 148284: A student mixes distilled water with a 90% solution of acid to produce a 50% solution. If 5 liters of water is used how much 50% solution is produced?
I know the answer is 11.25 but I am unable to figure out how they got to that answer.
I have tried setting water as x and 5 then acid as 90% and solution as 50% but any way I try does not get to the answer.
Help please!
Click here to see answer by stanbon(75887)

Question 148561: Hhi, I was wondering if someone could help me solve this problem. I am having a very long day and the answer just isnt coming to me...
Nail polish remover is essentially a mixture of water and a chemical called acetone.How much pure acetone must be combined with a solution that is 40% acetone to make 30 oz of a 58% solution?
Thank you very much for your help and your time.
Click here to see answer by scott8148(6628)

Question 148781: can someone please help me im stuck

8. (6 pts) Construct a truth table for (qp)  q

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Question 148779: 5. (2 pts) Rewrite ~(p  q) using DeMorgan's laws.
Click here to see answer by stanbon(75887)

Question 148803: A mixture of birdseed contains sunflower seeds worth $1.30 per kilogram and other seeds worth #0.90 per kilogram. How many kilograms of each kind must be used to produce 100 kilograms of mixture that sells $1.00 per kilogram?
Click here to see answer by ptaylor(2198)

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