Questions on Algebra: Proportions answered by real tutors!

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Question 558040: X:30 as 4:10

X=
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Question 558152: if y=45 when x=9, find y when x=7 solve.
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Question 558128: what is 15 to 4 as 9 to 2 times a number
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Question 558139: a school purchased five new basketballs for 149.95. at that rate, how much more money will it cost the school to have 12 new basketballs in all?
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Question 558226: 5:200 as X:40

X=
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Question 558781: 2/v = 1/8
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Question 559429: There is an interview where 100 people were interviewed and asked questions about if they heard a specific song on the radio television or both. 50 people listened to it on the radio, 30 people heard it on the television, and 20 people heard it on both. My question is: How and why does P(heard it on the television or radio) the same as P(heard it on the radio + heard it on the television - heard it on both)?
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Question 559930: 3x*16=12*4
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Question 560232: Please show the ratio answer as #:#.
Of the 13 Journeymen on a jobsite, there are 5 females. What is the ratio of males to females on this job?
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Question 560236: Find the unknown quantity for the following ratios and proportions.
The scale on a blueprint indicates that ½ " equals 10 feet. What would be the ratio for this blueprint?
(NOTE: Format answer as # in:# ft) (Use no periods after abbreviations.)
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Question 560295: what does it mean to equate the cross product?
hat size head circumference head circumference
7 7/8 24 61
7 1/2
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Question 560548: On a map, 1 inch equals 13.3 miles. Of two cities are 4.5 inches apart on the map, how far are they acutally apart
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Question 560853: What is 60% of 120?
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Question 561517: 15 is what percent of 10
24 is what percent of 50
what percent of 20 is 8
If you can help me with this plz help me thank u and plz show the work.
Click here to see answer by rfer(16322) About Me 
Question 562585: 48 is 70% of what number?
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Question 562772: The ratio of copper to tin is 23 to 2, if a bronze trophy has a mass of 2250g what is the mass of tin in the trophy?
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Question 562937: My teacher gave the answer -12. What is the steps to solve?
x/8 - 8 = -12
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Question 213023: by weight, the ratio of chlorine to sodium in table salt is 35.46 to 23.00. How much sodium is contained in 50.00kg or salt? Has to be set up as an appropriate proportion and then be solved.
Click here to see answer by math108(1) About Me 
Question 563500: a scale model of the eiffel tower is 5 inches tall. if the real eiffel tower is 450 ft. tall, what is the scale of the model?

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Question 563628: 8 men build a fence in 6 days. How much time will it take 12 men to build the same fence?
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Question 563815: A bottle is half full. AFter adding 275mL to the bottle it is three quarters full. How much does the bottle hold when full?
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Question 565017: You were assigned a locker for your books at school. You forgot the locker number but remember that two of the 12 positive factors of the locker number are 6 and 25. What is your locker number? Show or explain how you got your answer.
Click here to see answer by issacodegard(60) About Me 
Question 565526: What percent of 72 is 18? Use proportions.
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Question 565526: What percent of 72 is 18? Use proportions.
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Question 565640: 16 winners out of 200 entries and 28 winners out of 350 entries
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Question 566005: Nine identical pipes can fill a tank in 4hours. Given that the rate of water flow in all the pipes are the same, find how long it would take six of these pipes to fill the same tank.
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Question 565997: Suppose that y is directly proportional to x.
If y=12 when x=-4, what is the value of y when x=25?
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Question 566306: 54 over 72 = x over 100
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Question 566552: What is 'x' in 20-x/x=6/4
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Question 566744: What is the Ratio in simplest form 28 inches to 40 inches
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Question 567525: 66 is 40% of what number?
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Question 567594: P is inversely proportional to d^2
P = 10,000 when d = 0.4
Find the value of P when d = 0.8
I know that P = k/ d^2
so .. k/ 0.64 = 10,000
but i dont know how to use the numbers given to find the value
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Question 569347: whats 2/5 = 4/n what does n equal
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Question 569349: i need help with 3/2=18/8
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Question 569360: four-sevenths of a school's faculty are women. four-fifths of the male faculty members are married, and nine of the male faculty are unmarried. how many faculty members are there?
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Question 569745: What is the last digit (ones) of the product of the positive prime
numbers less than 50?
Show and explain how you got your answer.
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Question 571263: you have a total of 60 cupcakes; 36 are choc. You want 70% choc. How many more cupcakes do you need to bake ?
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Question 573922: The perimeter of a rectangle is 64 cm. The length is 4 cm less than twice the width. Find the length and widt
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Question 573941: perimiter of rectangle is 64cm the , the length is 4cm less than twice the width find the l&w I tried 4/64=32 2/32=16
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Question 573671: Mr. Green and Mr. Martin played a game of marbles. At first, the ratio of MR.Green;s to Mr. MArtins marbles was 8:3. But then Mr.Green gave 45 of his marbles to Mr. Martin. In the end they both had the same amount of marbles. Howmany marbles did Mr.Green start with?
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Question 574151: A can of soda holds 455 milliliters. If you pay 60 cents for a soda, what is the unit price per millilter?
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Question 574361: ONE NUMBER IS TWICE ANOTHER THE SUM OF THEIR RECIPROCALS IS 1.5 FIND THE NUMBERS
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Question 574812: (3x-5)/4=-5/7
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Question 575952: 2. Selecting a Card When a card is selected from a deck, find the probability of getting
a. A club
b. A face card or a heart
c. A 6 and a spade
d. A king
e. A red card
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