Questions and Answers on Finding the Average

• Find 5 numbers

  The first number is 15 The second number is 20 The third number is 25 The fourth number is 30, The fifth number is 35 And there are infinite solutions

  Learning help

  2 answers

• Average

  Sum of 5 numbers=38 × 5=190, The sum of the first three numbers=27 × 3=81, The sum of the last three numbers=48 × 3=144, Because there are middle numbers in the first three numbers and middle numbers in the last three numbers, the sum of the first three numbers plus the sum of the last three numbers minus the sum of five numbers is the middle number: 144+81-190=35

  mathematics

  5 answers

• There are seven numbers in a row

  There are seven numbers in a row. Their average number is 30. The average number of the first three numbers is 28, and the average number of the last five numbers is 33. Find the third number. 28x3 33x5-30x7=84 165-210=39 The third is 39

  mathematics

  9 answers

• mathematics

  Five numbers add up to 147.5, (29.5 * 5=147.5) Similarly, the sum of the first three numbers is 94.2, and the sum of the last three numbers is 82.5. If the sum of the first two numbers is a, the third number is b, and the sum of the last two numbers is c, then: a+b+c=147.5 a+b=94.2 b+c=82.5 Solution: b=29.2

  mathematics

  4 answers

• Given that the average number of seven numbers is 49, the average number of the first four numbers is 56, and the average number of the last four numbers is 68, find out what the fourth number is

  The first four: 28x4=112 The last four: 68x4=272 Four plus four is eight, but why is there only seven? Because the fourth one is repeated. So: (112 272) - 49x7=384-343=41

  mathematics

  1 answer

• The average of eight numbers is 7.5, the average of the first four numbers is 9.5, the average of the last five numbers is 8.8, and the fourth number is calculated

  8.8*5+9.5*4-7.5*8=22

  Learning help

  2 answers

• How many is the middle number?

  sixteen

  mathematics

  1 answer

• The average of the three numbers of A, B and C is 6, and the ratio of the three numbers is 1/2:2/3:5/6. Find the three numbers

  The ratio of three numbers is 1/2:2/3:5/6, which is first reduced to the simplest ratio and multiplied by 6 3:4:5 Let these three numbers be 3X, 4X, 5X (3X+4X+5X)/3=6 12X=18 X=1.5 These three numbers 1.5*3=4.5 1.5*4=6 1.5*5=7.5

  Learning help

  1 answer

• 4. What is the average of the four numbers

  9.2 (9.0 X 29.4 X 2) ÷ 4=9.2 can be calculated directly

  mathematics

  2 answers

• There are four numbers. Their average is 20. The average of the first three numbers is 24, and the average of the last two numbers is 14. Find the third number

  The sum of four numbers is 20 * 4=80, and the sum of the first three numbers is 24 * 3=72, so the fourth number is 80-72=8 The sum of the last two numbers is 14 * 2=28, so the third number is 28-8=20

  mathematics

  3 answers

• The average of five numbers is 167. The average of the first three numbers is 109. The average of the last three numbers is 216. Find the middle number

  If the five numbers are A1, A2, A3,, A4, A5, then A1 A2 A3 A4 A5 ＝ 167 × 5=835A1 A2 A3=109 × 3=327; A3 ,A4 A5=216×3=648A3=（A1 A2 A3） （A3 ,A4 A5）-（ A1 A2 A3 , A4 A5 ）=327 648-835=140

  mathematics

  7 answers

• mathematical problem

  The third number is 39 The average number of seven numbers in a row is 30, the average number of the first three numbers is 28, and the average number of the last five numbers is 33. The third number is 39

  mathematics

  3 answers

• Average

  The number was 50. (80-70) * 5=50, the average score of this number will increase by 10 points only after increasing by 50, so the original number is 100-50=50.

  Learning help

  3 answers

• Find the average of 243.43243.26243.36243.39243.28

  The sum of five numbers is 1216.72 The average is 243.344

  mobile game

  1 answer

• How to solve a third grade math problem?

  3×34-(6×27-4×23)=32

  mathematics

  3 answers

• Math problem in primary school: there are eight numbers. The average of the first five numbers is 105, and the average of the last four numbers is 113. Find the fifth number? Ask your friends to help us. It's urgent!

  My algorithm is the same as upstairs: 105 * 5+113 * 4-93 * 8=525+452-744=233 The fifth number is 233

  Friendly skills

  5 answers

• What is the fourth number?

  43×4＋4×72-56×7 =172+288-392、 =68

  mathematics

  1 answer

• Grade 3 math problems

  23×4+34×3-27×6=32 The fourth number is 32

  Learning help

  3 answers

• mathematics

  (The average of the first three numbers+the average of the last three numbers+the middle one)/3 =the average of seven numbers That is (28+33+x)/3=32 x = 35 The middle number is 35

  mathematics

  3 answers

• 12345 Add 4 numbers at random to find their average

  1 3 4 5=13 Average=3.251 2 3 4=10 Average 2.52 3 4 5=14 Average=3.5

  mathematics

  1 answer

• Given that the average number of 20 numbers is 6, the sum of their squares is 800, and find their square difference

  D=EX^-(EX)^=800/20-6*6=4

  mathematics

  1 answer

• What is the average number of a group of data?

  Average refers to the sum of all data in a group of data divided by the number of data. Average is the quantity that represents the trend of a group of data sets. It is an indicator that reflects the trend of data sets. The key to solving average word problems is to determine the "total quantity" and the total number of copies corresponding to the total quantity. In statistical work, the average (mean) and standard deviation are two of the most important measures to describe the trend and dispersion of data sets. I hope I can help you! (*^...

  mathematics

  1 answer