Tutors Answer Your Questions about Proportions (FREE)
Question 708576: Hi. I don't understand how I'm supposed to solve this problem. Could you please clearly explain how to set it up and solve it ...thank you.
The time is takes to build a skyscraper is proportional to its height and inversely proportional to the number of construction workers. If it takes 10 workers 2.5 years to build a 20 story building, how long will it take 40 workers to build a 120 story building?
_______ years
Click here to see answer by josgarithmetic(39616)  |
Question 708632: Gertrude and Bertha are sisters. They are responsible for keeping the family's driveway clear of snow. If they work together they can complete shoveling in 30 minutes. One day Gertrude had to do the job alone. It took her 40 minutes. How long would it have taken Bertha to shovel the same amount alone? You can assume that each girl always shovels at a constant speed.
Click here to see answer by josgarithmetic(39616) |
Question 708181: Respected Sir,
My Question is :
P,Q and R are three cities .The ratio of average temperature between P and Q is 11:12 and that between P and R is 9:8.The ratio between the average temperature of Q and R is ?
Thank you very much....
Click here to see answer by KMST(5328)  |
Question 709506: I am trying to solve a percent proportion. I am not sure how to set up the problem when it it throws in the y variable. Problem is 68% of 75y. Does the formula change when the problem is set up in the reverse such as 75y is 68 % of what. I can complete once formula is set up correctly just can't remember set up
Click here to see answer by josgarithmetic(39616) |
Question 711279: (b-a) over ay = (b^2-a^2) over bx. in this problem we are supposed to find the x to y ratio. I multiplied b-a times bx and got b^2x-abx, then the other side ab^2y-a^3y and then put it together: b^2x-abx=ab^2y-a^3y then I factored out a bx from the quantity onthe left and got (b-a) and factored out a ay on the right the right and got (b^2-a^2) so then it is set up like: bx(b-a)=ay(b^2-a^2) now im kind of lost I see the difference of two squares but I don't know how to do the next step or if the steps I did were even the right ones to begin with
Click here to see answer by tutor_paul(519)  |
Question 711637:
My question is;
Michael and Eduardo are selling boy scouts cookies (a recent invention to try and compete with girl scouts). the boys sold 57 boxes of cookies, and earned $195. If buttery tea dippers costs $2.00 per box and Nutty cost $3.50 per box, how many boxes of each did they sell?
Click here to see answer by checkley79(3341) |
Question 711700: YMy question is;
Lawrence High prevailed in Saturdays track meet with the help of 20 individual-event placers earning a combined 68 points. A first place finish earns 5 points, a second place earns 3 points, and third place earns 1 point. Lawrence had s strong second-place showing, with as many second-place finishes as first and third place finishers combined. (hint: the third equation will be as: y=x+z)
Click here to see answer by Stitch(470) |
Question 715668: The number of bacterial cells in a biology experiment doubles every hour. After 1 hour ,
there are 2 cells, after 2 hours there are 4 cells, after 3 hours they are 8 cells. After how
many hours will the number of cells become 1024?
Click here to see answer by Alan3354(69443)  |
Question 715853: BlueSky Air has the best on-time arrival rate with 80% of its flights arriving on time. A test is conducted by randomly selecting 16 BlueSky Air flights and observing whether they arrive on time.
What is the probability that 2 flights of BlueSky Air arrive late?
Click here to see answer by stanbon(75887) |
Question 716160: Pour decorer la maison de Mamie, Rudy aura besoin des 3/4 du rouleau de 12m de ruban rouge, du tiers d rouleau de 18m de ruban vert et des 3/5 du rouleau de 30m de ruban doré. Quelle longueur de chaque doit-il couper?
could you please respond in english, thank you. with how you work it out.
Click here to see answer by solver91311(24713)  |
Question 717322: The cost of the electricity to play a radio varies directly with the number of hours it is playing. It costs $10.00 to play a radio continuously for 20 days. At this rate, what would it cost to operate the radio for one day?
Click here to see answer by jndarrell(58) |
Question 717402: the illumination produced by a light source varies inversely as the square of the distance from the source. If the illumination produced 4 feet from a light source is 75 foot candles, find the illumination produced 9 feet from the same source.
Click here to see answer by jndarrell(58) |
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