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Question 448702: I need help with this homework problem:
A swimming pool can be filled in 17 hours if water enters through a pipe alone, or in 20 hours if water enters through a hose alone. If water is entering through both the pipes and the hose, how long will it take to fill the pool?
Click here to see answer by jorel1380(3719)

Question 444973: The Big Bull investment club has a portfolio that contains only two stocks. At the end of the year, stock A had gone up 8%, and stock B had gone up 10%. The total portfolio, which had a value of $10,000 at the beginning of the year, went up 9.2%. How much is the investment in stock B?
Click here to see answer by jorel1380(3719)

Question 449252: Hi, suppose you need to give a patient 40% potassium in saline, but all you have to hand is 20% in 1 litre (1000ml, how much would you give, Someone said 2 1 litre bags of the 20% saline, but you need half the volume to increase the concentration, would you give 500mls over 2bags of 20% saline?
Click here to see answer by jorel1380(3719)

Question 449685: Clear Shine window cleaner is 12% alcohol and Sunstream window cleaner is 30% alcohol. How much of each should be used to make 90 oz of a cleaner that is 20% alcohol.

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Question 449727: Hakan has 50 milliliters of a 10% acid solution. How many milliliters of 45% acid solution should he add to create a 35% acid solution?
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Question 461079: if you need 50lbs of an alloy that is 50% nickel how many pounds of an alloy with 80% must be mixed with an alloy that is 40% nickel
Click here to see answer by oberobic(2304)

Question 461143: Determine whether the point (1, 8) is a solution of the system
2x + 6y = 50
10x + 0y = 10
by substituting the point into each equation.
Click here to see answer by richard1234(7193)

Question 461319: How many gallons of a 70% acid solution must be mixed with 70 gallons of a 30% solution to obtain a solution that is 50% acid?
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Question 461308: A community 5k run will award $50.00 to the winner. 65 people entered and paid a $20.00 entry fee. Assuming they all are equally likely to win, what is the expected value and fair price for the competition. round to the nearest cent.
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Question 461275: I need help setting this world problem in the sytstem of linear equations and solving it using matrices.
Problem:
A custard recipe calls for 3 eggs and 2.5 cups of milk. A vanilla pudding recipe calls for 2 eggs and 2 cups of milk. A bread pudding recipe calls for 2 eggs, 2 cups of milk and 8 slices of bread.
A stocked kitchen contains 18 eggs, 1 gallon of milk, and 24 slices of bread. How many batches of each recipe should a chef make in order to use up all of the ingredients?
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Question 461548: how much solution of 20 percent acid, must be added to a solution of 25% to get 50 gallons of the 25 percent solution
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Question 460541: How many ounces of a 25 percent saline solution must be added to 50 ounces of a 13 percent saline solution to make a 20 percent saline solution?
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Question 458618: how many gallons of 60% antifreeze solution must be mixed with 100 gallons of 10% antifreeze to get a mixture that is 50% antifreeze?
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Question 440711: Please help me solve this equation:
Deanna want to find the distance across the lake from point B to point C. To do this, she took measurements from point A to both points. The disatance from A to B was 170 yards. The distance from A to C was 80 yards. What was the distance from B to C?
Click here to see answer by jorel1380(3719)

Question 441676: 1.The sum of the square of three consecutive integers is 50. Find all possible sets of the three numbers? Please explain or show work
2.a FRACTION HAS A VALUE OF 3/4. iF 4 is added to its numerator and 8 is subtracted from its denominator the value of the fraction is 1. what is the orginal fraction?
3. Suppose a movie theater sold 200 tickets and student tickets for a total of $980. if student tickets cost 4.50$ and adult tickets cost 6.50$. How many students and how many tickets were sold?

Click here to see answer by jorel1380(3719)

Question 439539: Walt made an extra $9000 last year from a part-time job. He invested part of the money at a 9% annual rate of interest, and the rest at an 8% annual rate of interest. At the end of the year, he made a total of $770 in interest. How much was invested at 8%?
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Question 439155: A coin purse contains 18 coins in nickels and dimes.The coins have a total value of $1.15. Find the number of nickels and dimes.
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Question 450058: A car radiator holds 2 gallons of fluid and initially is empty. If a mixture of water and antifreeze contains 70% antifreeze and another mixture contains 15% antifreeze, how much of each should be combined to fill the radiator with a 50% antifreeze mixture?
Click here to see answer by jorel1380(3719)

Question 450059: Two hundred tickets were sold for a baseball game, which amounted to $840. Student tickets cost $3, and adult tickets cost $5.
A. Let x be the nuber of student tickets sold and y be the number of adult tickets sold. Writ a system of linear equations whose solution give the nuber of each type of ticket sold.
B. Use the method of substitution to solve the system.
Click here to see answer by jorel1380(3719)

Question 451167: The equation y=5x+5 estimates the number of U.s. households in millions, expected to install devices that recieve and manage broadband tv and internet content to home, where x is the number of years after 2002. for what years will there be at least 20 million home with these devices?
Click here to see answer by jorel1380(3719)

Question 461620: Cindy can paint a house in 3 hr less time than Dustin. Together, it takes 18 hrs. How long does it take each to do the job by theirselves?

Click here to see answer by nerdybill(7384)

Question 451269: an electicial contractor paid $1040 for 36 light fixtures to be installed in a hotel lobby. if the first type of fixture costs $25 each and the second type of fixture costs $36 each, how many of each kind did he buy?
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Question 455500: A scientist wants to make 6 milliliter of a 30% sulfuric acid solution. The solution is to be made from a combination of a 20% sulfuric acid solution and a 50% sulfuric acid solution. How many milliliters of each solution must be combined to make the 30% solution?
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Question 455518: how many quarts of pure antifreeze must be added to 6 quarts of a 20% antifreeze solution to obtain a 50% antifreeze solution?
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Question 455624: A nut mixture is made with almonds that cost $8.00 per pound and peanuts that cost $3.00 per pound. The mixture costs $5.00 per pound. How many pounds of each type of nut should be used to make 20 pounds of this mixture?
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Question 455801: how many pounds of candy worth $0.90 per pound must be added tp 10 pounds of candy worth $0.60 per pound to form a mixture worth $0.80 per pound?
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Question 461757: Etch Clean Graphics uses one cleanser that is 25% acid and a second that is 50% acid. How many liters of each should be mixed to get 10 L of a solution that is 40% acid?
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Question 438858: The owner of a candy store wishes to mix candy selling for $1.50 per pound with nuts selling for $1.00 pere pound to obtain a party mix to be sold for $1.20 per pound. How many pounds of each must be used to obtain 50 pounds of the mixture?
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Question 438861: You had $50,000 to invest. the two funds you decided to invest in are the You-Risk-It Fund that yields 14% interest and the extra-dull fund that yields 6% interest. you earned $4,500 in interest income this year. How much did you invest in each fund?
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Question 461895: Can someone help me with this problem:
Solve s^2+2sp+p^2-16
The answer I have is s^2+ps+p^2-16, I know that cannot be correct, please help
Thanks
Click here to see answer by mananth(16946)

Question 461711: word problems a.) and b>) i really need help with this section been trying for hours.
A.)in a row of 8 chairs. how many ways can 5 people be seated?
B.)how many ways can 11 books be arranged on a shelf?
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Question 461726: five bent coins are tossed. the probability of heads is 2/3 for each of them. What is the probability that no more than 2 will show heads?
Click here to see answer by robertb(5830)

Question 461978: How many liters of water must be added to 50 L of a 30% acid solution in order to produce a 20% acid solution?
Click here to see answer by rwm(914)

Question 461979: A chemist wants to mix some pure acid with some water to produce 16 L of a solution that is 30% acid. How much pure acid and how much water should be mixed?
Click here to see answer by rwm(914)

Question 462023: I am resubmitting this problem once again, I entered it incorrectly the second time. The problem reads:
A picture frame measures 12cm by 20cm and 128cm^2 of the picture shows. Find the width of the frame
Thanks, again
Click here to see answer by JimboP1977(311)

Question 462039: How many liters of water must be evaporated from 10 L of a 30% salt solution to produce a 50% solution?

Click here to see answer by solver91311(24713)

Question 462071: how many liters of a 40% solution and how many liters of a 25% soulution must be mixed to obtain 105 liters of a 34% solution
Click here to see answer by rwm(914)

Question 462097: how many litres of 10% solution of acid should be added to 20 litres of a 60% solution of acid to obtain a 50% solution?
Click here to see answer by stanbon(75887)

Question 462040: How many gallons of 80% antifreeze solution must be mixed with 100 gallons of 10% antifreeze to get a mixture that is 70%antifreeze?

Click here to see answer by jorel1380(3719)

Question 437622: A lab technician has one solution that is 60% chlorinated and another that is 40% chlorinated. how much of each solution is needed to make a 100 L solution that is 50% chlorine?
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Question 437462: In triagle ABC, the measure of angle B is 41 degrees more than three times the measure of angle A. The measure of angle C is 64 degrees more than the measure of angle A. Find the measure of each angle.
Click here to see answer by jorel1380(3719)

Question 437021: Tim and Judy mix two kinds of feed for pedigreed dogs. They wish to make 27 pounds of feed worth $0.26 per pound by mixing one kind worth $0.17 per pound with another worth $0.36 per pound. How many pounds of the cheaper kind should they use in the mix?
Click here to see answer by jorel1380(3719)

Question 461715: pls help :)
A.) nine points are placed on a circle. how many triangles can be formed using these points, three at a time, as verticies?
Click here to see answer by richard1234(7193)

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