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Algebra: Average

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Question 226868: I am trying to help my son with homework, but we have no example to go by. Here is the question:
A health food store sells seasoning blends in bulk. One blend contains 20% basil. Sheila wants to add pure basil to some 20% blend to make 16 ounces of her own 30% blend. Let b reperesent the amount of basil Sheila should add to the 20% blend.

Click here to see answer by ankor@dixie-net.com(6693)

Question 227172: The average of 7 numbers is 39. Two of the numbers whose sum is 83 are removed. What is the average of the remaining numbers?

Click here to see answer by solver91311(5072)

Question 227172: The average of 7 numbers is 39. Two of the numbers whose sum is 83 are removed. What is the average of the remaining numbers?

Click here to see answer by Alan3354(6092)

Question 227701: solid gift wrap $4 each. printed gift wrap $6 each. the total number of gift wrap sold is 480. the total amount of money collected is $2340. how much gift wrap was sold for each kind?

Click here to see answer by rfer(2688)

Question 228007: Simplify and express using positive exponents.
NUMERATOR IS: 12a^7 + 16a^5 - 8a^2
DENOMERATOR IS: -4a^2
I do not know ALT keystrokes to express the fraction exactly as shown. I know the answer is:
(-3a^5 - 4a^3 + 2)but I have no idea why or how. Why is the answer not a fraction? fyi {12a^7= 12a to the seventh power} ect... Is there an affordable calculator I can buy that will compute the problem?
Click here to see answer by JenniferTutors(46)

Question 228928: In five years time, I will be three times as old as I was three years ago, how old am I now?
a) Write an equation using variables to represent the above statement.

b) Solve your equation to discover the age.
Click here to see answer by chibisan(120)

Question 229098: The ratio of ages of 2 persons A and B is 3:5.The sum of their ages is 80. After 10 years, what will be the ratio of their age
Click here to see answer by jsmallt9(594)

Question 229554: If you averaged 76% on two 100 point tests, what would you have to score on the next 80 point test to raise your average to 80%?

Click here to see answer by ankor@dixie-net.com(6693)

Question 230112: The mean, median and mode of 3 numbers are x, x+1 and x+1 respectively. Which of the following represents the least of the 3 numbers?
(A) x (B) x - 1 (C) x - 2 (D) x-3 (E) 2x - 2

Click here to see answer by Edwin McCravy(2922)

Question 230551: The average weight of 4 football players is 180 pounds. The weights of three of the players are 165 pounds, 185 pounds, and 215 pounds. What is the weight of the fourth player?
Click here to see answer by likaaka(51)

Question 230560: A student’s test scores are 86, 72, 85, and 90. What is the lowest score that
the student can get on the next test and still have a test average (mean) of at
least 80?
Click here to see answer by edjones(3298)

Question 231010: Determine if the following real number is both composite and rational, both prime and rational, only rational or only irrational.
the square root of 121
Click here to see answer by edjones(3298)

Question 231210: expresss f(x) in the form f(x)=(x-k)+r for -3x cubed plus 5x minus 6,k= -1
Click here to see answer by jsmallt9(594)

Question 231228: find the vertex, the line of symmetry, and the maximum value of f(x) graph. f(x)=1/3(x+1)^2+9
Click here to see answer by stanbon(26291)

Question 231957: Before the final exam, a student has 5 test scores of equal weight: 72, 80, 65, 78, and 60. If the final exam counts as one-third of the final grade, what score must the student receive in order to have a final average of 76?

Click here to see answer by ankor@dixie-net.com(6693)

Question 231746: The average of four numbers is 18. If one of the four numbers, 25, is taken away, what is the average of the remaining three numbers?
Click here to see answer by ankor@dixie-net.com(6693)

Question 232339: two cars are 900 miles apart both cars start at the same time and travel toward one another they meet 8 hours later if the speed of one car is 30 miles per hour faster than the other what is the exact speed of the faster car.
Click here to see answer by half-life(1)

Question 232757: What is b, if b+4b=8?
Click here to see answer by rfer(2688)

Question 233300: Conner is driving 65 mph on a highway. Ed is driving at 70 mph 15 miles behind Conner. After how many hours will Ed catch up to Conner?
Click here to see answer by edjones(3298)

Question 234075: you got 7 test scores but you mistakenly divided the correct sum by 6 which gave you 84 what is the correct average test score?
Click here to see answer by dawny74(8)

Question 234956: On five tests, on which scores could range anywhere from 0 to 100, Juan had an average of exactly 88. What is the lowest score Juan could have received on one test?

Click here to see answer by jsmallt9(594)

Question 234979: On five tests, on which scores could range anywhere from 0 to 100, Juan had an average of exactly 88. What is the lowest score Juan
could have received on one test?
a) 0 b) 20 c) 22 d) 40 e) 44
Click here to see answer by nerdybill(2446)

Question 235112: Another problem I just couldn't figure out and I'm still working on it . A product that cost 2,000 increase by 5% in June. The new June price of the product increased by 5% on December 1st. How many dollars did the product increase by Dec 1. I don't have a clue! Can you please help?
Click here to see answer by solver91311(5072)

Question 235464: Employee A and Employee B paychecks totaled $2,388.90. Employee A worked two hours and Employee B worked 43 hours during this time period. What is each of their hourly rate? (There hourly rates may (probably will) be different.)
A + B = $2,388.90
A/2 + B/43 = $2,388.90
This is what I think the two problems are supposed to be, but when I solve one for A to substitute in the other, it isn't working. HELP!!
Click here to see answer by solver91311(5072)

Question 238044: Angelo’s marks on the first three tests are 10/20, 15/20, and 17/20 what mark would he have to get on the next test to make his average on all four tests 15/20 ?
a) 15/20 b) 16/20 c) 17/20 d) 18/20 e) 20/20
Click here to see answer by edjones(3298)

Question 238459: the average test mark of three students is 16. if two of the students each received a mark of 24. what is the third student's mark ?
a) 0 b) 8 c) 16 d) 24 e) 40
Click here to see answer by checkley77(7072)

Question 238860: You drove 56 miles one way on a service call. On the return trip your average speed was 8 miles per hour faster and took 10 fewer minutes. What was the average speed on the return trip?
Click here to see answer by josmiceli(3012)

Question 239183: A student averages 84 on five tests. If the student received grades of 84, 82, 81, and 79 on the first four exams, what grade did the student receive on the fifth exam?
Click here to see answer by rfer(2688)

Question 240682: Steven has an average of 76% on his first 5 tests. What is the lowest score that he can get on his next test to have an average of 80% on all of his tests?
a. 76% b. 80% c. 90% d. 100%
Click here to see answer by checkley77(7072)

Question 240690: what is the average of 45690456, 456456756758, 5657457578567, 56778698786, 8678, 567875684545677586, 4356457, 8679, 8798999999, 456456456, 45634656, 456775674567, 4634356563454545, 454562212312, 34534545, 5675674567567 and 587890875093578023958735098357
Click here to see answer by nyc_function(260)

Question 240844: Fin two consectuive odd integers such that 4 times smaller the number is 7 more than 3 times the larger number.
Click here to see answer by checkley77(7072)

Question 241050: Andrea has an average of 87% on her first 5 tests. She has one test left to take. What is the lowest score Andrea can get and still have an average of at least 80% on her test?
A) 45 B) 73 C) 80 D) 43
Click here to see answer by checkley77(7072)

Question 241060: What is the average of the first 99 positive whole numbers?
A)49.00 B) 49.50 C) 49.75 D) 50

Click here to see answer by Alan3354(6092)

Question 241287: what is the ratio of the number of minutes in an hour to the number of minutes in a day
Click here to see answer by Theo(675)

Question 240379: Solve the proportion
3(a-4)/5=2a/6
Click here to see answer by Alan3354(6092)

Question 241286: Ryan scored 16, 22 and 24 points in three basketball games. What is the least number of points he must score in the next game to average at least 20 points per game for the four games?
Click here to see answer by checkley77(7072)

Older solutions: 1..45, 46..90, 91..135, 136..180, 181..225, 226..270, 271..315, 316..360, 361..405, 406..450, 451..495, 496..540, 541..585, 586..630, 631..675, 676..720, 721..765