Math Help.......?

Okay i here are the word problems:


(13)





1.The average score of the five tests was 83. The first four scores were 91, 78, 86, and 72. What was the score of the fifth test?





2. Benny guesed four hundred seventeen ten-thousandths and Jenny guessed gour hundred seventeen hundred-thousandths. Who guessed the most and by how much?





(16)





4. The cyclist pedaled the first 1,600 meters in 2 minutes. How long would it take her to pedal a total of 10,00 meters?





(21)





5. The walls collapsed because 3 and 1/2 times the design amount had been sotred inside. If 980 tons had been stored inside, what was the design amount?





6. An economical automobile can travel 416 miles on just 13 gallons of gasoline. How many gallons of gasoline will be needed for a trip of 1,792 miles?





(22)





7. The ratio of flowers to weeds was 2 to 7. If there were 164 flowers in the garden, how many weeds were there?





Please label each problem with the number i have next to it. And don't pay attention to the # in parenthises

Math Help.......?
1) The average score of the five tests was 83. The first four scores were 91, 78, 86, and 72. What was the score of the fifth test?





Average = sum of terms divided by number of terms.


Let x represent the fifth score.





(91 + 78 + 86 + 72 + x) / 5 = 83


(327 + x) / 5 = 83


327 + x = 415


x = 88





So the fifth score is 88.





2) Benny guessed four hundred seventeen ten-thousandths and Jenny guessed four hundred seventeen hundred-thousandths. Who guessed the most and by how much?





Four hundred seventeen ten-thousandths is 0.0417.


Four hundred seventeen hundred-thousandths is 0.00417.





0.0417 %26gt; 0.00417. To find the difference, subtract.





..0.04170


- 0.00417





The difference is 0.03753.





4) The cyclist pedaled the first 1,600 meters in 2 minutes. How long would it take her to pedal a total of 1000 meters?





1600 m / 2 min = 1000 m / x min


1600x = 2 x 1000


1600x = 2000


x = 2000/1600


x = 1.25





1.25 minutes is your answer.





5) The walls collapsed because 3 and 1/2 times the design amount had been stored inside. If 980 tons had been stored inside, what was the design amount?





Let x represent the design amount.


So, 3 1/2 times the design amount had been stored inside, and what was stored inside is 980 tons.





3 1/2 x = 980


(7/2)x = 980


x = 980 / (7/2)


x = 980 x 2/7


x = 1960/7


x = 280





The design amount is 280 tons.





6) An economical automobile can travel 416 miles on just 13 gallons of gasoline. How many gallons of gasoline will be needed for a trip of 1,792 miles?





416 miles / 13 gallons = 1792 miles / x gallons


416x = 13 x 1792


416x = 23296


x = 56





56 gallons of gasoline will be needed.





7) The ratio of flowers to weeds was 2 to 7. If there were 164 flowers in the garden, how many weeds were there?





2 : 7 = 164 : x


2x = 7 x 164


2x = 1148


x = 574





There were 574 weeds.





_______________________________





10 points? :o)
Reply:1 88 calculate the differnce of eac score from the average.


you'll be left with a -5. thus you need a +5 to support the avg of 83





2 Benny. Ten Thousands are bigger than hundred thousands





4.If you mean 1000 minutes and your comma is wrong, it is


2 min /2 or .8 or a minute = 48 seconds.





5. 980 / 3.5 =272





6. 68.92gals. This is not an even number although 1,792 "looks" divisible by 416, it is not 4 x 416 is 1664 miles for the easy but wrong answer of 52 gallons.





7. this one IS easy. Divide flowers by 2, multiply by 7.


164 divide by 2 = 82.


82 times 7 = 560 + 14 = 574





Happy day.


Make me #1


This one sure was a ten pointer.





Stephen M
Reply:So. . .you're asking for people to do your homework for you?





The best advice I can give is to identify want the question is asking for and then identify what information is given. From that, you should be able to figure out what you need to do to solve the question.





For example:





1. What is it asking for?


**a missing test score.





What information is given?


**the number of test scores is: 5


**the average of those five is: 83


**four of the test scores are: 91, 78, 86, and 72





You should know that an average is simply (the total of a bunch of values) divided by (the number of values), so you can put the given information into formula form:





Average = (total of a bunch of values) / (number of values)


83 = (91+78+86+72+??)/5





You now need to solve for ?? to find the missing score.








Sometimes, the information may not seem clear, so write it in number format with units. For example:





7. What is it asking for? The number of weeds.





What information is given?


**the number of flowers: 164 flowers


**the ratio is: 2 flowers / 7 weeds (or 7 weeds / 2 flowers)





Treat the words 'flowers' and 'weeds' as units: you want units of 'weeds', but you're starting with units of 'flowers'. That should suggest the formula you need because dividing 'flowers' by 'flowers' will cancel them out:





Number of weeds = (164 flowers) * (7 weeds) / (2 flowers)


Number of weeds = (164*7/2) weeds





This way of looking at the units to figure out the formula will help you in questions 4 and 6 as well.





Or I could just answer with deliberately wrong numbers--if you can't (or won't) do the work yourself, how can you tell if I lied?



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