Questions on Algebra: Proportions answered by real tutors!

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Question 388378: How many people could live in these dimensions?
1,377 miles wide. 1,377 miles long and 1,377 miles high?
Click here to see answer by Alan3354(30993)

Question 388343: A bookstore reduced the price of a book with 25%. after that the sale rose by 10%.
With how many percent rose the number of sold books?
Click here to see answer by robertb(4012)

Question 388609: a garrison of 1600 men is provisioned for 18 weeks at the rate of 25 kg per day per man.if some more persons join the garrison, the provisions would last for 16 weeks at the rate of 20 kg per day per man. find the number of persons joining the garrison.
Click here to see answer by mananth(12270)

Question 389204: A Suzuki Khyber car journey takes 4/1/2 (4 whole 1 over 2) hrs when the car travels at an average speed of 120 km/h. Calculate the time taken for the same journey when the average speed is reduced to 108 km/h.
Click here to see answer by mananth(12270)

Question 389355: if a:b :: c:d, show that
c^2 : d^2 = (a^2 +c^2): (b^2 + d^2)
Click here to see answer by robertb(4012)

Question 389359: If a:b :: c:d, show that:
ac : bd = (a^2+c^2):(b^2+d^2)
Click here to see answer by robertb(4012)

Question 389497: The amount of pollutants A entering the atmosphere is directly proportional to the population P living in an area. If 25000 tons of pollutants enter the atmosphere in an area with a population of 17750, how many tons of pollutants enter the atmosphere in Manila with a population of 2450500? ( need a complete solution) thanks

Click here to see answer by robertb(4012)

Question 389597: how do you find the gcf of 7 and 15
Click here to see answer by Alan3354(30993)

Question 389608: Last month a company made 1000 gloves with 60 workers. This month the company hired 15 more workers. At the same rate, how many gloves can be made this month?
Click here to see answer by sudhanshu_kmr(1152)

Question 389670: Hello, this is my question:
To be able to see your complete reflection in a mirror that is hanging on a wall, the mirror must have a minimum length of "m" inches. The values of "m" varies directly with your height "h" (in inches). A person 71 inches tall requires a 35.5 inch mirror. Write a linear model that gives "m" as a function of "h". Then find the minimum mirror length required for a person who is 66 inches tall.
*I think I need to use the direct variation equation "y=ax" and I was thinking the linear equation might look like this: f(h)=m, but I don't know the rest. Thank you so much!!!!!!
Click here to see answer by richard1234(5390)

Question 389669: The weight W of an object is directly proportional to its weight B on earth. A man who weighs 118.75 kg on Earth weights 47.5 kg on mars. Find the weight of a man on Mars if he weighs 98 kg.
Click here to see answer by ewatrrr(10682)

Question 389826: a map has a scale of 1 centimeter:120 kilometers. Use the given actual distance to find the distance on the map. Actual distance = 60km
Click here to see answer by mananth(12270)

Question 389839: The amounts of pollutants A entering the atmosphere is directly proportional to the population P living in an area. If 25000 tons of pollutant enter the atmosphere in an with a population of 17750, how many tons of pollutants enter the atmosphere in manila with a population of 2450500?
Click here to see answer by mananth(12270)

Question 390206: Can you please help me with this?

Van Gogh’s painting Starry Night measures 92 cm long by 73 cm high. You buy a poster that shows an enlargement of the painting. The poster measures 120 cm long by 100 cm high. Is the poster an accurate representation of the painting?
Click here to see answer by solver91311(16877)

Question 390444: A farmer who is 72 inches tall is standing beside a silo that has a height of 140 feet. The length of the silo's shadow is 31.5 feet. What is the length of the farmer's shadow?
Really appreciate your help on this one.
Click here to see answer by rfer(12657)

Question 390502: A basketball player made 36 free throws in 16 games. find the ratio of free throws to games
Click here to see answer by edjones(7569)

Question 390669: 60% of 60 is what number?
Click here to see answer by checkley79(3050)

Question 390717: What is the proportion of 300 out of 8
Click here to see answer by checkley79(3050)

Question 390772: a/40=30/100
i tried and i got 12. i dont know if its the right answer can you explain it to me?
Click here to see answer by stanbon(57337)

Question 390900: if a,b,c are in continued proportion, prove that:
(a^2+b^2+c^3)/(a+b+c)=a-b+c
and hence find three numbers in continued proportion so that their sum is 14 and the sum of their squares is 84

Click here to see answer by robertb(4012)

Question 390892: "If the 481 children's books represent 13% of the books in the library, how many total books are in the library?"
Use a percent equation and Use a proportion

Click here to see answer by robertb(4012)

Question 390893: Jeremy bought a souvenir while on vacation. The item cost $22.00, but the otal bill was $23.43, What percent was the sales tax?
Use a percent equation and Use a proportion
Click here to see answer by robertb(4012)

Question 391167: x-7=2x-6
Click here to see answer by haileytucki(390)

Question 391230: 535 is what percent of 825
Click here to see answer by rfer(12657)

Question 391395: x2+4
Click here to see answer by solver91311(16877)

Question 391414: does this have a solution?
A/48=2/6
Click here to see answer by solver91311(16877)

Question 391468: the scale model of an 84-inch long couch is7 inches long
Click here to see answer by Alan3354(30993)

Question 391734: if the fare of 12 quintal luggage for a distance of 18km is 20 rupees,how much fare be aluggage of 8 quintal for a distance of 20km?
Click here to see answer by stanbon(57337)

Question 392453: Solve for x in the following 3:80::x150
Click here to see answer by Alan3354(30993)

Question 392557: solve the proportion 5/7 = 20/d
Click here to see answer by haileytucki(390)

Question 392553: i need some real world situations that involve ratio and proportions

Click here to see answer by mananth(12270)

Question 392816: solve for x in proportion
3 over x = 20 over 7
7 over 12 = x over 30
11 over 3 = x over 8
how do i solve these problems?
Click here to see answer by richard1234(5390)

Question 392816: solve for x in proportion
3 over x = 20 over 7
7 over 12 = x over 30
11 over 3 = x over 8
how do i solve these problems?
Click here to see answer by checkley79(3050)

Question 393208: (1 pt) A card is drawn randomly from a standard 52-card deck. Find the probability of the given event.
(a) The card drawn is 9.
The probability is:
(b) The card drawn is a face card.
The probability is:
(c) The card drawn is not a face card.
The probability is:

---------------------------
(1 pt) 4 cards are drawn at random from a standard deck.
Find the probability that all the cards are hearts.
Find the probability that all the cards are face cards.
Note: Face cards are kings, queens, and jacks.
Find the probability that all the cards are even.
(Consider aces to be 1, jacks to be 11, queens to be 12, and kings to be 13)

Click here to see answer by ewatrrr(10682)

Question 393411: paul can walk 2 1/2 miles in 1 hour. How far can he walk in 1 3/4 hours?
Click here to see answer by rfer(12657)

Question 393411: paul can walk 2 1/2 miles in 1 hour. How far can he walk in 1 3/4 hours?
Click here to see answer by edjones(7569)

Question 393515: A rock show is being played on television.The lead singer,who is 75 inches tall, is 15 inches tall on the tv monitor.The image of the bass player is 13 inches tall on the monitot.How tall is the bass player?
Click here to see answer by neatmath(300)

Question 393756: Completely lost on this question:
x2-3 x
---- = --- (That's x(ex)squared minus 3 over 5 x(ex)plus 2 equals x over 5)
5x+2 5
I think i have to cross distribute for ex. 5(x2-3) and x(5x+2).
Is that right? Then what do i do?!
Please help!
Thanks!

Click here to see answer by CharlesG2(828)

Question 393989: solve the proportion for x/3= x+10/6
Click here to see answer by pie90010(44)

Question 394083: If a person makes $30,000 in 2004 and the inflation rate 4% annually, how much is this salary worth in the year 2008(in terms of 2004 dollars)?
Click here to see answer by pie90010(44)

Question 394106: solve the proportion.
p/3.7 = 8.0/2
Click here to see answer by mananth(12270)

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