Questions on Algebra: Proportions answered by real tutors!

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Question 248718: The theoretical probability of undesirable side effects resulting from taking Pyrene is 1 in 15. If 180 people take Pyrene to relieve congestion, theoretically how many will encounter undesirable side effects?
Click here to see answer by edjones(7569)

Question 248883: If A can perform a task in 24 hours and B can perform the same task in 40 hours, how long does it take A and B working together? show equation and solve
Click here to see answer by chosenpoint(26)

Question 248941: Q1 ) 24 men working at 8 hours per day can do a piece of work in 15 days. In how many days can 20 men working at 9 hours per days do the same work.

Click here to see answer by Alan3354(30993)

Question 249043: determine if the quantities in each pair of ratios are proportional.
34 students from 8 schools and 25 students from 6 schools
Click here to see answer by checkley77(12569)

Question 249132: Speed varies inversly with time of travel. It takes 6 seconds to travel between two highway markers at 45 mph. write the equation and show the proportionality constant. How fast are you driving if it takes 5 seconds to travel between the markers?
Click here to see answer by Theo(3464)

Question 249204: 16 yellow marbles, 6 green marbles and 7 red marbles. What is the chance of drawing a yellow marble? If a yellow is drawn first and then a second marble is drawn without replacement, what is the probability of drawing a green marble?

Click here to see answer by richwmiller(9143)

Question 249470: if one painter can paint a house in 6 hours, and another painter paints a house in 9 hours. How long will it take them to paint the house working together
Click here to see answer by oberobic(2304)

Question 249966: I need help trying to figure this problem out....3/4=x/x+3
4X=3(x+3) right???
this is where i am stumped
Click here to see answer by College Student(505)

Question 249966: I need help trying to figure this problem out....3/4=x/x+3
4X=3(x+3) right???
this is where i am stumped
Click here to see answer by richwmiller(9143)

Question 250288: what is the missing number: (x^3+8x^2+kx+4)?
Click here to see answer by Alan3354(30993)

Question 250555: A quarterback completes 12 out of 20 passes in his first game, how many passes
would you expect him to complete in his second game if he only throws 15 passes?
Click here to see answer by MRperkins(300)

Question 251431: 1.A certain bank pays 1% compound interest for their savings account holders. If Nick deposits $10000 in that bank. (refer page 707 in the text book) (40 points) Formula = A= P (1 + r)^t
a. Estimate how much money will be in his account after 25 years using your formula. Assume there will not be any deposits or withdrawals during that 25 year period.

b. Estimate how long it will take to double the total amount (i. e. the total is $20000) in Nick’s account.

c.Estimate the total amount in Nick’s account after one year.

Click here to see answer by stanbon(57377)

Question 251275: the ratio of blue marbles to red marbles in a box is 4 to 9. if there are 91 blue marbles and red marbles in the box altogether then how many red marbles are there?
Click here to see answer by checkley77(12569)

Question 251502: Solve the proportion for x.
a)
20
24
=
x
18
b)
:5
x
=
1:25
5
c)
6:3
7
=
13:5
x
7. A tree casts a shadow that is 115 ft long. At the same time a yard stick
(a ruler that is 3 ft long) casts a 5 ft shadow. How tall is the tree?
8. An inspection nds 40 defective parts in a shipment of 500. How many
defective parts would you expect in a shipment of 1200?
9. For these questions use Activity 15 on page 420 of your textbook. The
rate at which calories are burnt is proportional to the weight of the person:
a) At what rate would a 115-pound person burn calories while running
in place?
b) At what rate would a 175-pound person burn calories while swimming
at 25 yd/min?
Click here to see answer by richwmiller(9143)

Question 251499: Write these ratios as whole numbers in simplest form.
a) 25 to 35
b) 111
2 to 5
c) 82
3 to 141
5
2. Write these ratios as whole numbers in simplest form.
a) 45 minutes to 2 hours
b) 4 gallons to 6 quarts
c) 3 dimes to 10 nickles
Click here to see answer by richwmiller(9143)

Question 251718: n-6 n-5
--- = ---
3n 3n+1

Click here to see answer by checkley77(12569)

Question 251736: I need help on how to solve for equivalent rates:
Example: are these two rates equivalent?
A)$18 us/$24 canadian = $45 us/$48 canadian

Click here to see answer by edjones(7569)

Question 251956: If Liz sang at a wedding for 20minutes and got paid $25, how much would she get paid for singing for 40minutes?
write a proportion and then answer the question.
how do you do this?
Click here to see answer by rfer(12662)

Question 252163: AHOPKEEPER HAS THREE TYPES OF BLACK PULSE COSTING RS.60, RS.72 AND RS.90 PER KG RESPECTIVELY. OUT OF THEM THE FIRST TWO TYPES OF PULSE ARE MIXED IN THE RATION OF 2:3. IN WHAT RATIO THE THINRD TYPE OF PULSE SHOULD BE MIXED SO THAT THE COST OF MIXTURE WILL BE RS.78 PER KG?
Click here to see answer by palanisamy(496)

Question 252217: WHAT ARE TWO PRPORTIONS OR 2/5

Click here to see answer by checkley77(12569)

Question 252216: WHAT ARE TWO PROPORTIONS FOR 1/3
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Question 252325: what is thenarrative description of this im lost √100
Click here to see answer by Alan3354(30993)

Question 252681: x is directly proportional to y^2. When y is 3, x is 6. Then y is 6, what is x?
A) 6 B) 10 C) 12 D) 18 E) 24
Click here to see answer by susanaramya(12)

Question 252723: A college student pays $280 for a three hour course. How much would he have to pay for a class load of 16 hours? Round your answer to the nearest whole dollar
Click here to see answer by drk(1908)

Question 253034: 24/6 = n/5 what does n equal? Please work out the problem.
Click here to see answer by richwmiller(9143)

Question 253033: The shadow of a building is 280 feet long. At the same time, a 5 foot tall boy's shadow is 2 feet long. How tall is the building? Please show me how to work out this problem.
Click here to see answer by richwmiller(9143)

Question 253109: I forget the formula that applies to this problem (3a-1)^2 Do I multiple 3*2=9would I write the problem as 9a^2 +1?
Click here to see answer by palanisamy(496)

Question 253109: I forget the formula that applies to this problem (3a-1)^2 Do I multiple 3*2=9would I write the problem as 9a^2 +1?
Click here to see answer by jim_thompson5910(28595)

Question 253717: how much pure water must be mixed
with 2 liters 40% solution of antifreeze to get a 25% antifreeze mixture?
Click here to see answer by richwmiller(9143)

Question 253775: The ratio of an angle to its complement is 2/3. Find the angle and its complement.
Click here to see answer by palanisamy(496)

Question 253849: Harold wants to cover the floors of his home with carpeting. He has 1,728
square feet of floor to cover.
Part A
Write a proportion to find n, the number of square yards of carpet he needs to
buy.
Proportion____________________________
Part B
Solve your proportion to find how many square yards of carpeting Harold needs to buy.
This is what I was thinking, but I need help:
___n____ = _________
1728 100
but I'm confused because the 1,728 is square feet, and the proportion mentions square yards. Is the missing number 3 because there are 3 feet in each yard? That is my thinking.
i don't know if my proportion is set up right.
Click here to see answer by Alan3354(30993)

Question 253923: Here's the question
It costs $350 for a case of 150 jars of modeling clay. It costs $672 for a case of 450 jars of modeling clay.

What is the unit price for a jar in the case of 150 jars?

What is the unit price for a jar in the case of 450 jars?
Which case of jars of modeling clay is the better buy?
Please help me set up the proportion and answer.
Click here to see answer by richwmiller(9143)

Question 253911: Duriing her trip to Europe, Mary learned that 1 euro was equivalent to the
value of 1.28 U.S. dollars.
Part A. Mary began her trip with $2000 U.S. dollars.How many euros did she
have?
Show your work
2,000 divided by 1.28 = 1562
Answer 1562 euros
Is this correct?
Part B
After her trip, Mary had 740 euros left. What was the value in U.S. dollars?
show your work
740 X 1.28 - $947.20
Are my two answers correct?
Click here to see answer by MRperkins(300)

Question 254017: missing number 2/3w=0
Click here to see answer by edjones(7569)

Question 254087: four over nine equals x over fifteen
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Question 254229: All I need is a little help understanding how to solve a proportion. The problem is . my teacher actually didn't have time to teach us because we had a test today. thank you for help and time!
Click here to see answer by richwmiller(9143)

Question 254353: You are looking at a map to see how much further it is to your destination. The distance on the map is 1.6 inches. If the map has a scale of 1 mile is 1/32 of an inch, how much further do you have to go?
Click here to see answer by ankor@dixie-net.com(15657)

Question 254589: im trying to figure out what to do with the remander...
the problem is
15 5
- -
10 H
i know i must cross multiply and i get 15H and 50 then divide but i get a remander of 5.. i dont know what to do with the remainder
Click here to see answer by richwmiller(9143)

Question 254590: Draw two similar rectangles whoses sides are in ratio of 5.
Click here to see answer by JimboP1977(308)

Question 254590: Draw two similar rectangles whoses sides are in ratio of 5.
Click here to see answer by Jeff Gordon(65)

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