# Questions on Algebra: Average answered by real tutors!

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 Algebra: Average Solvers Lessons Answers archive Quiz In Depth

 Question 586113: Mark rides his bike 100 meters in 5 min,225 meters in 8 mins. and 175 meters in 7 mins.what is his average speed? Click here to see answer by stanbon(57377)

 Question 586177: in a math contest, each team is asked 50 questions. The teams earn 15 points for each correct answer and lose 8 points for each wrong answer. One team finished with a score of 566 points. How many questions did the team answer correcty Click here to see answer by edjones(7569)

 Question 586453: Heather's test scores are 81,93,74,and 95, What is the score she must earn on the next test in order to get a mean of 85 on the five tests? Click here to see answer by Earlsdon(6287)

 Question 586857: You have taken 4 tests and have an average of 75 points. If you score 100 on each of the rest of the tests, how many more tests do you need to take to raise your average to 80 points? Click here to see answer by scott8148(6628)

 Question 587166: If i have a 91, 73, 82, and a 74 what score do i need to get an average of 82 Click here to see answer by lwsshak3(6513)

 Question 587328: What is the average of 30 and 67? Click here to see answer by solver91311(16897)

 Question 587371: Gina earns score of 65,78,85, and 82 on four tests. What grade must she earn on the next to have an average of 80? Click here to see answer by solver91311(16897)
 Question 587371: Gina earns score of 65,78,85, and 82 on four tests. What grade must she earn on the next to have an average of 80? Click here to see answer by josmiceli(9690)
 Question 587371: Gina earns score of 65,78,85, and 82 on four tests. What grade must she earn on the next to have an average of 80? Click here to see answer by abush(5)

 Question 587348: sophie's average mark on 3 tests was 80.the mark on the first test was 76. her average for the first two tests was 18 more than the mark on the third test. what marks did she get on the second and third tests? Click here to see answer by lwsshak3(6513)

 Question 587705: Solve/write an algorithm to find the average score on 5 quizzes and determine if the average is less than 60 Click here to see answer by Theo(3464)

 Question 587813: i have a 75% in my math class. we just took our exam. our exam is worth 15% of our grade. i got a 45% on my exam. what is my overall grade for the trimester now? Click here to see answer by Alan3354(30993)

 Question 588010: The question states the following: The mean of Wes's first 4 math tests is 88. However, he wants to raise his average to a 90. What score will Wes have to make on his 5th test in order to have an overall mean of 90? I am thinking that his previous test scores could have been all 88s because 88+88+88+88= 352. 352 divided by 4 is 88. And then the average of that is still an 88, like it said they were in the problem. So what I thought was that, if each test was indeed an 88, then he was 2 points away from a 90 on each of the four tests he took. So i lined up the four test scores of 88 and to the side, I said (+2) in parenthesis next to each score. I did that because if you add 2 and 88, you get 90. So, if there were 4 test scores, and he needed two more points on each test to get a 90, that's 4 times 2 to get 8. Add 8 to 90 and you get 98. To check my work, I took the four 88% tests PLUS the new 98% and found the average of those. In other words, 88+88+88+88+98= 450. 450 divided by 5= 90. And 90 is the new average/mean grade that we want. I want to make sure this is correct. Thank you very much for your help! I really appreciate it! Click here to see answer by nerdybill(6962)

 Question 588182: Hi. I have a word problem that I just can't wrap my head around. Could you please help me? "Professor Baird wants to mix a solution containing 10% acid with one containing 15% acid to obtain a 20-ounce solution containing 12% acid. How many ounces of the 10% solution should the professor use?" Thanks for the help. Joey Click here to see answer by josmiceli(9690)

 Question 588187: a student's grade in a course is determined by 4 quizzes and 1 exam. If the exam counts twice as much as each of the quizzes, what fraction of the final grade is determined by the exam Click here to see answer by KMST(1869)

 Question 588782: Please help me solve this: Marcus tried to compute the average of his 8 test scores. He mistakenly divided the correct total S of his score by 7. The result was 12 more than what it should have been. Which equation would determine the value of S? A. 8S-12=7S B. S/7=S+12/18 C. S/7+12=S/8 D. S/7-12=S/8 Click here to see answer by jim_thompson5910(28595)

 Question 588785: What is the area of the square EFGH? E=(-4,2); F=(-1,5); G=(2,2); H=(-1,-1) A. 27 units^2 B. 9sqrt(2 units ^2 C. 18 units^2 D. 12sqrt(2 units ^2 Click here to see answer by richwmiller(9143)

 Question 588771: What is the z score for each number: 50,75,75,100 Click here to see answer by edjones(7569)

 Question 589250: Bill is twice as old as Sue. Jim is four years older than Bill. How old are each of them if all of their ages add up to 79. Click here to see answer by richwmiller(9143)

 Question 589336: A mother is three times as old as her son. Six years ago she was five times as old as her son. What is their present age? Click here to see answer by stanbon(57377)

 Question 590384: The total of all the scores that Sam received on his four tests in German is 338. What must Sam receive on his fifth test in order for his average to be an 87? Click here to see answer by josmiceli(9690)

 Question 590527: A metal alloy is 25% copper. Another metal alloy is 50% copper. How much of each should be used to make 1000 grams of a metal that is 45% copper? Show your system of equations and all work! Click here to see answer by mananth(12270)

 Question 591205: Hi, This a a question for my assessment. A new excavation site fits a parabola with the equation y = x squared + 11x + 10 The hole must be more than 10 metres wide across the top for a bobcat to be able to dig it. If the ground level is taken as the x-axis, is the hole able to be dug by a bobcat? Use Mathematical procedures to explain why or why not Thankyou Click here to see answer by nerdybill(6962)

 Question 592123: Lauren has grades of 98 and 86 on her first two chemistry quizzes. What must she score on her third quiz to have an average of at least 91 on the three quizzes? Click here to see answer by josmiceli(9690)

 Question 592523: on a test daniel answers 4 times as many questions correctly as he did incorrectly. If he answered 40 questions, how many did he answer incorrectly? write an equation for the problem and solve. Click here to see answer by rfer(12662)

 Question 592507: If I got 68 points out of 82 on a test. What is my percentage? Click here to see answer by rfer(12662)

 Question 1129: What is the definition for the "root of the equation" when doing algebra? Thanks THE ZERO OF THE QUADRATIC FUNCTION, THAT IS, VALUES OF X WHICH F(X)=0, ARE THE ROOTS OF THE EQUATION. Click here to see answer by 55^10(2)

 Question 593124: Using complete sentences, explain how to graph y = one third x + 4 using the slope-intercept method. Click here to see answer by Edwin McCravy(8909)

 Question 589209: A fish pond at the local park is a regular hexagon. a. Write a formula for the perimeter of the pond in terms of the length of a side. Explain your formula. b. Each side has a length of 7.5 feet. Find the perimeter of the pond. c. Suppose the designer of the pond wants to make another regular hexagonal pond with a perimeter of 57.6 feet. Find the length of one side of the pond. Explain your method. Click here to see answer by ZhangYan(1)

 Question 593822: over the past week 34 baby boys were born at the hospital. this was 54 percent of all the babies born how many girls were born over the past week? answer is 29 i just have no idea how they found it, thank you so much!! Click here to see answer by scott8148(6628)

 Question 594520: Our teacher gave us a worksheet and there's some questions I don't understand. One is this... The sum of an integer and three more than three times the next consecutive integer is 30. Find the integers. And we are using the 5 step method and I just can't get all the steps right, except number one. Please help. Click here to see answer by mananth(12270)

 Question 595209: If f(4) = 0 and f(6) = 6, which of the following could represent f(x)? A. 2/3x-4 B. x + 2 C. x - 4 D. 3/2x + 6 E. 3x - 12 Click here to see answer by richwmiller(9143)

 Question 595218: What is the average (arithmetic mean) of 8, 7, 7, 5, 3, 2, and 2? A. 3 4/7 B. 4 5/6 C. 4 6/7 D. 5 E. 6 4/5 Click here to see answer by Alan3354(30993)

 Question 595500: if the average of x, y, and 35 is 20 less than the average of y, z, and 100, what is the value of x-z? Click here to see answer by ankor@dixie-net.com(15657)

 Question 595984: A student scores 72 out of 100. if the maximum score on the next test is also 100 points, what score does the student need to have an average of 79 Click here to see answer by rfer(12662)