Questions on Algebra: Proportions answered by real tutors!

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Question 12145: The ratio of nitrogen to phosphorus to potash in a fertilizer is 7 : 5 : 3. If there are 35 kg of nitrogen, calculate the mass of the phosphorus and the mass of the potash.
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Question 11203: 2b(3+c)-b(2-c)
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Question 12382: using the numbers 2,4,6,8,and10 exactly once with any operation signs and grouping symbols to write an expresion equal to 0

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Question 12642: I need to know how to find 68% of 50 Is there any way you can give me the formula or a way to find the % of whole numbers like that?
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Question 12757: A model airplane is made to the scale 1 inch to 24 inches. If the wing of the actual plane is 18 feet long, how long will the model wing be?
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Question 12764: The ratio of teachers to assistants to children at a day care center is 2:1:9. Of the 96 people at the center,how many of them are children?
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Question 12751: Two out of 3 students in Mr.Pearson's ninth grade class recycle aluminum cans. If 48 students recycle aluminum cans,how many students are in Mr.Pearson's class?
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Question 12959: Bill gave one-third of his jellybeans to a friend, ate two-thirds of the remaining jellybeans, and had eight jellybeans left over. How many jellybeans did Bill have originally?
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Question 13265: Two cities on a map were 2 1/4 in. apart. The cities are actually 56.25 miles apart. What scale was used to draw the map?

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Question 12766: Write an equation and solve the following: Four times a number decreased by twice the number is 100. What is the number ?
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Question 13730: The lengths of three sides of a triangle are in the ratio 3:5:6. The perimeter of the triangle is 28 cm. Find the lengths of each side of the triangle.
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Question 14363: If John paints a house in 4 hours and Cindy paints a house in 6 hours, how long would it take them if they painted the house together??
HELP!
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Question 14924: What is the answer to An 8-ounce bottle of lotion costs $4.50. What is the cost per ounce?
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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
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Question 15267: HOW TO SOLVE THE RATIO OF 2 TO 5=(?)%
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Question 15866: how do i simplify 1/4d+2-3/5d+5
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Question 16218: Can you do 5/24=X/600 ???
I can't do it but I can do all other proportions....
Click here to see answer by elima(1433)

Question 16434: 24/40 = T/30
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Question 16445: 49/56 =r/32 Is the answer 28????
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Question 16450: 49/56 = r/32
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Question 16692: my son is in 7th grade aap math. we are having problems understanding the teachers example. could anyone help show how to work 3(x+6) step by step
thank you
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Question 16874: x/4 = 3/2
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Question 17086: how do you figure out whether 5/8=2/9 is proportion?
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Question 17408: how can i learn algebra?
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Question 17672: A recipe for 2 1/2 dozen whole sheat muffins requires 600g of flour. How many muffins can be made with 900g of flour?
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Question 17671: Deborah has a recipe that makes 4 dozen chocolate chip cookies. It requires 2 cups of chocolate chips for every 5 cups of flour. If she needs 36 cookies, how many cups of chocolate chips will she need?
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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.
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Question 17911: what percent of 16 is 5?

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Question 18963: Please help me solve this problem
A rock show is being televised the lead singer, who is 75 inches tall, is 15 inches tall on a tv monitor. The image of the bass player is 13 inches tall on the monitor. How tall is the bass player?
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Question 19324: A leaky faucet wastes 1/20 gallon of water each hour.In how many hours will 3/4 be used@
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Question 19548: how can i make a make a circlegraph to display each set of data.and this hw is due tommorrow so HELP!!!!!!!!!
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Question 19761: how do you solve the problem 3(x-2y)=-12(x+2y)?
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Question 20009: What percentage of 24 is 72?
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Question 20077: How do you solve multiplication problems with three proper fractions?
For example: 2 1/2*1/5*11/3
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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)

?
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Question 20678: what is the proportion of 6 /X = 9/12?

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Question 19827: 3(x+2)+7=12
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Question 20979: I need help on percent proportions. This problem: 42 is what percent of 48? to find the percantage what do i do ? Help Please !! Thanks Helen

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Question 21285: Three out of 5 people attending Dustin's party were girls. If 12 girls attended, how many people were at the party?
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Question 21304: what is 18/30=v/4 ?

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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 21421: Cindy saved $27.75 in 4 weeks.At that rate,how long will it take her to save $156?
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