Tutors Answer Your Questions about Proportions (FREE)
Question 751049: An island has 12 fur seal rookeries (breeding places). To estimate the fur seal pup population in Rookery A, 6861 fur seal pups were tagged in early August. In late August, a sample of 600 pups was observed, and 219 of these were found to have been previously tagged. Use a proportion to estimate the total number of fur seal pups in Rookery A.
The estimated total number of fur seal pups in Rookery A is ____. (Round to the nearest whole number.)
Additional instructions: Set up a proportion, and then use the cross products principle of proportions. If a/b=c/d, then ad=bc. Be sure to round to the nearest whole number.
Click here to see answer by josgarithmetic(1501) |
Question 747824: Hi, I can't understand the answer as explained in the link below.
http://www.algebra.com/algebra/homework/word/misc/Miscellaneous_Word_Problems.faq.question.477023.html
Can you kindly help me?
Thanks,
Moazzam
Click here to see answer by lynnlo(4155) |
Question 746235: please help me solve this question ; aliff bought some lollipops and gave half of them to bob. bob bought some chocolates and gave half of them to aliff. aliff ate 4 chocolates and bob ate 7 lollipops. after that the number of chocolates and lollipops, aliff had were in the the ratio 1:8.the number of chocolates and lollipops bob had were in the ratio 1:5. how many lollipops did aliff give to bob?
Click here to see answer by MathTherapy(1422)  |
Question 745067: Please help me solve this problem:
The smallest mammal, Kitti's hog-nosed bat has a head-body length of 1 7/50inches and a wingspan of about 5 1/10 inches. A scale drawing of this little bat is made showing it in full flight. The wingspan on the drawing is 15 inches. What should the length of the bat be in the drawing?
L= 1 7/50
15= 5 1/10
15 x 1.14 = 17.10 / 5.10 = 3.35 or 3 1/3
is this correct
Click here to see answer by stanbon(57290) |
Question 744773: You have 100 random selected students . What is the probability half of the group has blue eyes ? What's the probability at least 25 percent of the group has blue eyes ?draw probability distribution for this exercise .
Click here to see answer by stanbon(57290) |
Question 740792: I am rated at work either 4, 2, or 3 in 4 categories. Each category holds a weigh:
One is 40%; two are 25%; and one is 10%
In the 40% category I was rated 3 out of 4
In both 25% categories I was rated 3 out of 4
In the 10% category I was rated 2 out of 4
What should my total rating be? Can you please show me the calculation?
Thanks!
Click here to see answer by lynnlo(4155) |
Question 739971: I have tried to solve the following GMAT math problem for hours!
After spending 5/12 of his salary, a man has 140.00 dollars left. What is his salary?
The choices given were : 200.00. 240.00. 300.00. 420.00 583.00
The answer is. 240.00 I just do not understand how they got their answer.
The answer is based on the following: the man did not spend 7/12 of his salary. Ok, I got that understanding. However, they say that 140.00 represents 7/12 of his salary(I have no idea why they say this?) Set up a proportion where S is equal to his salary:
7/12 is equal to 140 divided by S. The answer is 240.00.
I tried to figure out the value of 1/12 . Forget that.
Then I set up the following proportion: If 5/12 is equal to 140, then 7/12 is equal to what value.
The answer I got was 336.00. That was not one of the choices.
I am completely stumped. Kindly help me with this supposedly easy proportion problem.
Sincerely, Ellen Motoi
Click here to see answer by josgarithmetic(1501) |
Question 737098: How do I set these up?
It takes 13 people to pick 112 watermelons in a day. How many people would it take to pick 200 watermelons in a day?
Set up a proportion for the following situation.It takes Todd 8 minutes to eat 5 pies at a pie eating contest. How many pies can Todd eat in 15 minutes?
Click here to see answer by josgarithmetic(1501) |
Question 736619: A simple random sample of 250 Americans revealed that 112 of them owned a DVD player.
DVD companies, as an industry, brag that half of all Americans own a DVD player
At the 10% level, the DVD industry's claim should be
Rejected or not Rejected ?
Click here to see answer by lynnlo(4155) |
Question 736387: Hi,
Here is the problem I need help with-
The diameter of a dinner plate is 1 ft. In a dollhouse set, the
diameter of a dinner plate is 1 and 1/4 in.What is the ratio of the diameter of the
dollhouse plate to the diameter of the full-size plate?
Please help me out
This is what I have so far-
1ft= 12 in
I think I have to write as followed
1.25/12 in
but I don't know what to do?
Help please
Thank you
Click here to see answer by Simnepi(204)  |
Question 735855: James Caleb and Abigail bought a pizza. James ate 1//6 of the pizza and Caleb ate 1/4 of the pizza.
What fraction of the pizza did james and Caleb eat together? I got 5/12
Abigail ate 2/5 of the pizza that was remaining. What fraction of the original whole pizza did Abigail eat?
Click here to see answer by stanbon(57290) |
Question 735606: I have an unlimited number of bags containing marbles.
Each bag contains only two colors - black and one other color.
Some have 45% aquamarine marbles.
Some have 45% blue marbles
Some have 60% cyan marbles
If I take one bag of each color and mix all three bags together in a larger bag (in a ratio of 1:1:1) then the resultant bag would contain the following of each color represented as a percentage:
15% aquamarine marbles
15% blue marbles
20% cyan marbles
(based on the relationship that the final bag contains the 300 marbles so the percentages of each is calculated as total color marble/300).
If I enter a ratio of 2:1:2 then my final percentages are:-
18% aqua marbles
9% blue marbles
24% cyan marbles
What ratio of my original bags would I need to combine together to have a new bag containing a final percentage of the color marbles equaling:-
10% aquamarine marbles
5% blue marbles
20% cyan marbles
(I can use part of an original bag but must use the original percentage of black and color marbles e.g. I could use half of a blue bag which would yield 27.5 black marbles and 22.5 blue marbles)
Click here to see answer by lynnlo(4155) |
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