Questions on Algebra: Average answered by real tutors!

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Question 281075: find average of 4 and 2/7,9 and 3/8
Click here to see answer by Fombitz(13828)

Question 281164: Helping my son, 7th grade. We need help please.
Q- average for five quizzes is 86. To have an average of 88 or more for six quizzes, what is the lowest score to get on the sixth quiz?
Thanks.
Click here to see answer by richwmiller(9143)

Question 281069: if a : b = 3 : 4 the value of (2a+3b):(3a+4b)
Click here to see answer by checkley77(12569)

Question 281177: Helping my son, 7th grade. We need help please.
Q- average for five quizzes is 86. To have an average of 88 or more for six quizzes, what is the lowest score to get on the sixth quiz?
Thanks.
Click here to see answer by scott8148(6628)

Question 281306: How do you find the average out of 4,5,8,9,11,13
Click here to see answer by rfer(12678)

Question 281230: Yabbas (Y) are inversely proportional to the number of Dabbas (D).
a)write a general equation that summarizes this relationship.
b)when 51 Dabbas produce 3 Yabbas, what is the constant of proportionality?
c)how many Dabbas would be needed in order to produce 17 Yabbas?

Click here to see answer by dabanfield(803)

Question 281990: What is the average (arithmetic mean) of 8, 7, 7, 5, 3, 2, and 2 ?
The answer has to be in fractions, which I don't understand how to get.
Click here to see answer by stanbon(57424)

Question 282362: he arithmetic mean, or ordinary average, of a set of fifty numbers is 32. The average of a second set of seventy numbers is 53. Find the average of the numbers in the sets combined.
A) 44.25 B) 60 C) 42.5 D) 40 E) 50.25
Click here to see answer by edjones(7569)

Question 282382: What is the average?
A total of 50 juniors and seniors were given a math test. The 35 juniors attained an average score of 80 while the 15 seniors attained an average of 70. What is the average score for all 50 students who took the test?

Click here to see answer by richwmiller(9143)

Question 282411: you have 4 numbers four numbers are all y's. I need to figure out x for the top number I made staight A's in Algebra in school I feel stupid HELP My daughter is only in 7th grade. I did this in the 9th I have a feeling I'm in trouble.
?___?___?___?________X___ 10, 12, 14, 16 Y

1

Click here to see answer by dabanfield(803)

Question 282786: The mean of a collection of six numbers is 35. When three more numbers are added to the collection, the mean becomes 42. What is the mean of the three numbers added to the collection?
Click here to see answer by Greenfinch(383)

Question 280789: Just this one or two question please:
Let Set 1 be the entire alphabet. Let Set 2 = {a, b, c, d, e}
a. What is the complement of Set 2 in Set 1?
b. Set 3 = {b, c, d}. Is Set 3 a proper subset of Set 2? Explain your reasoning.

Click here to see answer by richwmiller(9143)

Question 283072: Going into the last game of the season, a basketball team had averaged 83.8 points per game. In their last game, they scored 97 points, raising their season average to 84.2 points per game. How many games did they play?
a)27 b) 31 c) 32 d) 33 e) none of these

Click here to see answer by richwmiller(9143)

Question 283079: The average (arithmetic mean) age of a group consisting of teachers and engineers
is 40. If the teachers average 35 and the engineers 50 years old, then the ratio of the number of teachers to the number of engineers is:
(A) 3 : 2 (B) 3 : 1 (C) 2 : 3 (D) 2 : 1 (E) 1 : 2
Click here to see answer by richwmiller(9143)

Question 283086: Janine received test scores of 88%, 92%, 79%, 94%, and 86%. What is the minimum score she must receive on her final exam if the five test scores are weighted equally, the final exam score is weighted twice as much as each test score, and if she wishes to have an overall average of 91%?
a) 91% b) 95% c) 89% d) 99%
e) It is impossible for her to score high enough on the final exam to have an
overall average of 91%.

Click here to see answer by richwmiller(9143)

Question 283759: adam tried to compute the average of his 7 test scores. he mistakenly divided the correct sum of all of his test scores by 6, which yielded 84. what is adam's corect average test score?
Click here to see answer by Alan3354(30993)

Question 283764: a total of 50 juniors and seniors were given a mathematics test. the 35 jrs attainted an average score of 80 while the 15 srs. attained an average of 70. what was the average score for all 50 students who took the test?
Click here to see answer by dabanfield(803)

Question 283900: if bob has a hose and a swimming pool it takes 3 hours to fill the pool and it takes 5 hours to empty it with the drain open. If bob leaves the drain open and the hose on how long will it take to fill the pool?
Click here to see answer by richwmiller(9143)

Question 284067: A) round 64,982.7866 to the nearest hundred.
b)round 97,840.27 to the nearest ten-thousandth.

Click here to see answer by richwmiller(9143)

Question 284162: After four geometry tests this nine weeks, Jessica's average score is 88%. What score does she need on her next test in order to raise her average to 90%?
Click here to see answer by stanbon(57424)

Question 284178: 5+3
Click here to see answer by Alan3354(30993)

Question 284710: 3. Ginger over the course of an average work-week wanted to see how much she spent on lunch daily. On Monday and Thursday, she spent $5.43 total. On Tuesday and Wednesday, she spent $3.54 on each day. On Friday, she spent $7.89 on lunch. What was her average daily cost?
answer: $4.08
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This question is from a practice placement test for SMC. here is the url
http://www.testprepreview.com/modules/averagesandrounding.htm
Taking the average of an average is already confusing but this problem goes beyond that. I tried using matrixes but it wont work since we have two equations but three variables. (the equations being derived from the meaning of average--such as adding two days and dividing by two)I also tried trial and error but it still did not work.
thank you for your time
Click here to see answer by edjones(7569)

Question 284719: The average age of the 40 members of a computer science camp is 17 years. There are 20 girls, 15 boys, and 5 adults. If the average age of the girls is 15 and the average age of the boys is 16, what is the average age of the adults?
(A) 26 (B) 27 (C) 28 (D) 29 (E) 30
Click here to see answer by mananth(12270)

Question 285011: a student completes three tasks and recieves marks of 25,15,12 she completes a fourth assessment task and achieves an overall average of 14.5 for the tests. assuming x is the result she obtained in the fourth task calculate x. help me please asap.
Click here to see answer by hollytree(4)

Question 285125: There is a list of seven numbers. The average of the first four numbers is 5, and the average of the last four numbers is 8. If the average of all seven numbers is
6 4/7 then the number common to both sets of four numbers is
a 5 3/7 b 6 c 6 4/7 d 7 e 7 3/7
Click here to see answer by richwmiller(9143)

Question 285148: If a student has grade of 90,78, and 82 on the first three math test, what steps would you take to find the grade the student must get on her fourth math test to have an average of 90?
Click here to see answer by stanbon(57424)

Question 285451: Write the equation that relates time (T˅b) in terms of rate (R˅b) and distance (D˅b).
Click here to see answer by stanbon(57424)

Question 285462: A jar contains 15 blue and 10 red marbles.
a) if one marble is drawn at random, what is the probability that it is red?
b) if two marbles are drawn randomly, what is the probability that the first is red and the second blue if first marble is replaced in the jar prior to drawing the second marble?
c) what is the probability that both are red if the first marble is not returned to the jar prior to drawing the second marble?
Click here to see answer by edjones(7569)

Question 285469: the _________________ theorem states that_____________________, where a and b represent the lengths of the legs of a right triangle and c represents the length of the hypotenuse.
Click here to see answer by mananth(12270)

Question 285545: In 2003, the average monthly rainfall in Mathborough was 41.5 mm. In 2004, the average monthly rainfall in Mathborough was 2 mm more than in 2003. The total amount of rain that fell in Mathborough in 2004 was
(A) 500 mm (B) 522 mm (C) 496 mm (D) 498 mm (E) 1700 mm
Click here to see answer by checkley77(12569)

Question 285678: one day you drove to school at an average speed of 20 miles per hour later the day you drove home at an average speed of 30 miles per hour what is the average speed for the two trips?

Click here to see answer by nyc_function(2733)

Question 285633: a) the rational root theorem states if p and q are real numbers and if p*q=0, then _____________________________________.
b)The fundamental Theorem states if p and q are real numbers and if p²=q², then _______________.

Click here to see answer by richwmiller(9143)

Question 285706: I need a 75% in order to pass my class. Presently I have an average of 72.8%. What do I need to make on the last test in order to pass the class?
Click here to see answer by richwmiller(9143)

Question 285452: Write the formula for the lateral surface area of a prism.
Click here to see answer by nyc_function(2733)

Question 285455: How do you figure P=4b+d-7c
Click here to see answer by nyc_function(2733)

Question 285789: Your grades in your math class on the last five tests are 83, 92, 78, 96, and 89 and you wish to have an overall average of 90 in the class. What grade must you average on your next three tests?
A. 89 B. 90 C. 92 • D. 94 E. None of these.
Click here to see answer by Grinnell(63)

Question 285947: What is the average of 54, 75, 73, 95, 234, 356, 762, 634, and 4275?
Click here to see answer by richwmiller(9143)

Question 286241: What is the cruising speed of the CD-10?

Click here to see answer by stanbon(57424)

Question 286457: A student would like to have an average grade of 90 for 4 exams. His first 3 tests were 88, 79 and 94. What does he have to get on his 4th exam to get that 90 average? X is supposed to be the student's 4th exam score.
Click here to see answer by texttutoring(324)

Question 286765: A car travels 150 km in 1 hour and 20 minutes. What is the average speed of the car in km per hour.
Click here to see answer by checkley77(12569)

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, 766..810, 811..855, 856..900, 901..945, 946..990, 991..1035, 1036..1080, 1081..1125, 1126..1170, 1171..1215, 1216..1260, 1261..1305, 1306..1350, 1351..1395, 1396..1440, 1441..1485, 1486..1530, 1531..1575, 1576..1620, 1621..1665, 1666..1710, 1711..1755, 1756..1800, 1801..1845, 1846..1890, 1891..1935, 1936..1980, 1981..2025, 2026..2070, 2071..2115, 2116..2160, 2161..2205, 2206..2250, 2251..2295, 2296..2340, 2341..2385, 2386..2430, 2431..2475, 2476..2520, 2521..2565, 2566..2610, 2611..2655, 2656..2700, 2701..2745, 2746..2790, 2791..2835, 2836..2880, 2881..2925, 2926..2970, 2971..3015, 3016..3060, 3061..3105, 3106..3150, 3151..3195, 3196..3240, 3241..3285, 3286..3330