Questions on Algebra: Proportions answered by real tutors!

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Question 352931: what is the answer to v/46=34/23
Click here to see answer by jim_thompson5910(35256) About Me 
Question 346906: A mole is a unit of measurement used in chemistry. The masses of one mole of three elements are:
Hydrogen---mass of one mole is 1.008 grams
Carbon----mass of 1 mole is 12.011 grams
Oxygen---mass of 1 mole is 15.999 grams
a 100 gram sample of ascorbic acid conatins 4.58 grams of hydrogen. To the nearsest tenth, find the number of moles of hydrogen. The ratio of moles of hydrogen to moles of carbon in ascorbic acid is 4:3. How does this ratio compare with the ratio of moles of hydrogen to moles of oxygen in ascorbic acid?
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Question 353270: Could you help me with making a proportion,to help find sales tax? If a dress costs $22.50 and the sales tax is 7.5%
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Question 353365: A particular fraction is equivalent to two thirds. The sum of its numerator and denominator is 105. What is the numerator of the fraction? Show your work
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Question 353154: John can do a piece of work in 8 days and peter can do the same piece of work in 6 days.They work together on it for two days and then peter stops working altogether.How long will it take for john to complete the remaining part of the work by himself?
Click here to see answer by Fombitz(32388) About Me 
Question 353893: 10. If the total cost of x apples is b cents, what is a general formula for the cost, in cents,
of y apples?
A. b
xy
B. x
by
C. xy
b
D. by
x
E. bx
y
Click here to see answer by jim_thompson5910(35256) About Me 
Question 354088: The scale on a map indicates that 1.5 centimeters represent 200 miles .if the distance on the map between Norfolk, Virginia , and Atlanta, Georgia , measures 2.4 centimeters , how many miles apart are the cities ?
Click here to see answer by mananth(16946) About Me 
Question 354869: There are four cars entered into a pinewood derby race. In how many different orders can they cross the finish line?
a) 10
b) 16
c) 4
d) 24

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Question 355316: A flagpole casts a 12-meter long shadow on level ground and the same instant that a meter stick casts a shadow 80 centimeters long. How tall is the flagpole?
a. 9 meters
b. 15 meters
c. 18 meters
d. 20 meters
Click here to see answer by edjones(8007) About Me 
Question 355610: I am having trouble getting the correct answer to this problem. The problem is
1/x+3 = -2x/x+5
This is how I worked it. The answer is -5/2, -1 but I keep getting -5/6
x+3(-2x) = x+5(1)
x-6x = x+5
-6x = 5
divide through by -6 and get -5/6.
What am I missing?
Click here to see answer by unlockmath(1688) About Me 
Question 355610: I am having trouble getting the correct answer to this problem. The problem is
1/x+3 = -2x/x+5
This is how I worked it. The answer is -5/2, -1 but I keep getting -5/6
x+3(-2x) = x+5(1)
x-6x = x+5
-6x = 5
divide through by -6 and get -5/6.
What am I missing?
Click here to see answer by mananth(16946) About Me 
Question 355621: This is a word problem. I tried to use the formula for inverse variation, y=k/x but I am still not getting the correct answer and I think it is because I do not know how to plug the #s in correctly.
Question: The length of time that a given # of bushels of corn will last when feeding cattle varies inversely with the # of animals. If x bushels will feed 25 cows for 10 days, how long will the feed last for 10 cows?
I know the answer is 25 days, I just do not know how to get it.
Thanks!
Click here to see answer by edjones(8007) About Me 
Question 355798: If a company provides 1 1/4 vacation days to its employees every month, how many vacation days does an employee get every year?
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Question 355812: I do not see how you can possibly get a numeral from this question. The answer id 12 but I have no clue how to get it.
"The volume of a rectangular solid varies jointly with its length, width and height. If the length is doubled, the width is tripled and the height is doubled, by what factor is the volume multiplied?"
Thanks for any help you can provide
Click here to see answer by sudhanshu_kmr(1152) About Me 
Question 355810: I cannot figure out how to get the answer to this question.
Under constant temperature, the volume occupied by a gas is inversely proportional to the pressure applied. If the gas occupies a volume of 20 cubic inches under pressure of 6 lbs per square inch, find the volume when the gas is subjected to a pressure of 10 lbs per square inch.
If you could please work this out for me to show how to get the answer I would apprecicate it.
Thanks,
Click here to see answer by scott8148(6628) About Me 
Question 356251: If the length of a plastic plane is 12 inches long and the length of the actual plane is 72 feet long. what is the model of the dimension?
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Question 356358: Latoya drove 440 miles using 18 gallons of gas. At this rate, how many gallons of gas would she need to drive 330 miles
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Question 356831: Jolly builds a large corkboard for her room that is 45 inches tall and 63 inches wide .she wants to build a smaller corkboard with a similar shape for the kitchen. Which of the following could be the dimensions of that corkboard?
A 4 in by 3 in
B 7 in by 5 in
C 12 in by 5 in
D 21 in by 14 in
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Question 356954: Find the discount rate on a $20 watch that regularly sells for $25
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Question 357501: in a resort during the summer months, only one out of eight people is a year round resident. the others are there on vacation. if the year round population of the area is 3000, how many people are there in the summer?
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Question 357705: if twice a number is increase by 7,the results is the same as if 5 times the number is diminished by 2, find the number.
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Question 357711: two numbers are in the ration is 1:3.if the sum of the two is increased by 2, the results is 18.find the smaller number.
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Question 357685: 
Hi, I'm working on homework, and the following problem has confused me. 
4        -3w+2    
--  =     --
7        -2w

I can't seem to find the value of w
Click here to see answer by Edwin McCravy(20054) About Me 
Question 358266: how do you multiply y?
for example:
5y * y?
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Question 358272: how to solve 1200 ounces to tons?
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Question 358272: how to solve 1200 ounces to tons?
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Question 358892: john read 66 books in 12 months at this rate how many books will he read in 4 months
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Question 358892: john read 66 books in 12 months at this rate how many books will he read in 4 months
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Question 359123: What happens to the Area of a circle if you double the radius? I know the answer is the area would be four fold but I don't know why. I though the area would be doubled.
What happens to the Area of a circle if you square the radius?

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Question 359690: solve for the unknown in the following proportion show work x/8=15/24 and
a/4= 2/5/10
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Question 360415: It took Lance and Ivan 6 hours to travel 33 miles downstream by canoe.The next day the travelled upstream for 8 hours for 20 miles.What was the rate of the current? What was their average speed in still water?
Click here to see answer by ankor@dixie-net.com(22740) About Me 
Question 361097: 3n(7n-20)=96
i have gotten to
21n squared -60=96
then im stuck :(
please expain how to work this or at least show the steps.
Click here to see answer by edjones(8007) About Me 
Question 361189: The ratio of Julio's money to Marcus's money was 7:10. After Julio bought 4 books at $4.50 each the ratio of Julio's money to Marcus's money was 1:4. Use a bar graph to find how much money Julioo and Marcus have left.
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Question 361315: james spent 2/5 of his money. If he spent $630 how much did he save?
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Question 361669: 4/9= r-3/6
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Question 361714: t+4/t-2 = 1/4 please help me solve this proportion
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Question 361733: two numbers are in the ratio 9:13. If the larger number is 390, find the smaller
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Question 362104: 5kg = ----- g. in proportions
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Question 362783: How do you draw a rectangle
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Question 362797: how to use proportionality propot
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Question 362898: Again, not sure if it's a proportion problem...
at the same time of day, a man who is 52 inches tall casts a 66- inch shadow and his son casts a 33-inch shadow. What is the height of the man's son?
some of the choices are 26 in, 78 in, 99 in, or 27 in.
heeeelp! :D
Click here to see answer by mananth(16946) About Me 
Question 362891: I think this is a proportion problem. A survey indicated that 5 out of 9 doctors use Zed pain reliever. If 3600 doctors were surveyed, how many use Zed?
I got x= 2000. Is this correct?
Click here to see answer by Fombitz(32388) About Me 
Question 363776: Charlotte has 16 3/8 feet plastic pipe. She cuts off a 4 1/3 foot length and than 7 1/2 foot length. How long is the remaining piece of pipe.?
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Question 363973: can u write me a porportion problem down and check it 2 see if it is write?
Click here to see answer by stanbon(75887) About Me 
Question 363934: At a particular time, the ratio of the height of an object that is perpendicular to the ground to the length of its shadow is the same for all objects.
If a 30-ft three casts a shadow of 12 ft, how tall is the tree that casts a shadow of 14 ft?
Click here to see answer by edjones(8007) About Me