Tutors Answer Your Questions about Proportions (FREE)
Question 15124: solve these proportions. One of the examples in my text book was
65/10 = 13/x
10 x x/63+63 x 2/9
x=14
I dont get how to do any of these I get how you times the top left corner w/ the bottom right corner and the bottom left coner w/the upper right corner but after those steps I dont get also heres a problem im on.
3/8 + 12/x
Click here to see answer by Earlsdon(6294)  |
Question 17697: Hello, my question is a pre-algebra one and I have tried to work it out like this, but first of all the question is: A factory manufactured 30,000 tennis blls in 2 weeks. Out of every 1000 tennis balls produced 15 defective. What proportion can be used to find the number of tennis balls, t, that were judged to be defective in the 2 weeks?
This is how I worked it out: 30,000 tennis balls = 1,000 tennis balls
___________________ __________________
15 defective t
= 15(1,000)
= 15,000 = 30,000(t)
__________ = ___________
30,000 = 30,000t
t= 0.5
Could you please let me know if I missed something or if I worked it correctly? Thank you, Karissa
Click here to see answer by xcentaur(357) |
Question 17913: I tried so many times to get the answer but i can't the problem is What percent of 16 is 5? The first thing i did i put 100 for the deominator then i put x for the numirator then i multiplied across. then i seen if it could be reduced and i still couldn't get my answer.
Click here to see answer by whisper(27) |
Question 20391: Moonshine has 50 liters of 70% alcoholic solution. How many liters of pure alcohol would you need to add to make an 80% solution?
70% solution 50liters .70(50 + p)
Alcohol p 1.00p
80% solution 50 + p .80(50 + p)
?
Click here to see answer by Paul(988) |
Question 21240: The scale on a map is 1:500. One inch on the map would represent how many feet in real life?
I think it would be 500 feet because 1in to 500 feet ratio. but I do not think that there is enough information to make that choice.
Click here to see answer by piglet162431(90) |
Question 21437: b + a 1
_______ = ___
ab f
solve for b.
this is a proportion b+a over ab equals 1 over f.
after cross product i dont know how to get the b by it's self. I have been given the answer but dont know how to get there...
the answer is b= fa over a-f
Click here to see answer by Earlsdon(6294) |
Question 22688: Selena and Tracey play on a softball team. Selena has 8 hits out of
20 times at bat, and Tracey has 6 hits out of 16 times at bat. Based on
their past performance, what is the probability that both girls will get a
hit next time at bat?
Click here to see answer by stanbon(75887) |
Question 22839: ((x^2-4)/(x^2-4x-21))/((x^2-7x+10)/(X^2-2x-35))
This particular problem has been giving me lots of trouble. I figured that you would have to factor the bottom of the fractions to make them have four terms but I am stuck there. Id appreciate the help Thanks!
Click here to see answer by rapaljer(4671)  |
Question 22845: Hello, My name is Tim Hunt.
I need help with some problems, Please help me.
1. A 10 ml vial contains 40 mg of a drug. How many mcg would be administered by injection of 2 ml of the drug?
2. many milliliters of a liquid laxative should be dispensed if the dose prescribed is for 1 tablespoonful qid for 3 days?
3. . If the flow rate for normal saline (NS) is 30 drops per minute over 6 hours, how many milliliters of NS would the patient receive (assuming 18 gtts/ml)?
PLEASE HELP IF YOU CAN
Click here to see answer by Earlsdon(6294) |
Question 22856: Hello, My ame is Delores Pack
I'm not that good in math, so I came to place that probably can help me.
I'm struggling, and getting stressed out.
1. How many 0.0125 grain doses can be made from 3/8 grains of a drug?
2. A formula for 1000 tablets contains 11.5 grams of an antihistamine. How many grams of the antihistamine should be used to prepare 475 tablets?
3. If a syringe contains 28 mg of drug in 3 ml how many milligrams of the drug would a patient receive if 1.2 ml is administered?
Click here to see answer by Earlsdon(6294) |
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