Arithmetic average

The arithmetic mean of the five numbers is exactly 8. The sum of these four numbers is 30. What is the fifth number?

Correct result:

x =  10

Solution:


(30+x)/5 = 8

x = 10

Our simple equation calculator calculates it.

Try another example


We would be pleased if you find an error in the word problem, spelling mistakes, or inaccuracies and send it to us. Thank you!






Showing 0 comments:
avatar




Tips to related online calculators
Looking for help with calculating arithmetic mean?
Looking for a statistical calculator?
Do you have a linear equation or system of equations and looking for its solution? Or do you have quadratic equation?

You need to know the following knowledge to solve this word math problem:


 
We encourage you to watch this tutorial video on this math problem: video1

Next similar math problems:

  • Norm
    rajcata Three workers planted 3555 seedlings of tomatoes in one dey. First worked at the standard norm, the second planted 120 seedlings more and the third 135 seedlings more than the first worker. How many seedlings were standard norm?
  • Simple equation
    axes_1 Solve for x: 3(x + 2) = x - 18
  • Simple equation 8
    eq1 Solve the following equation: 36=-(1+7x)-6(-7-x)
  • Cakes
    cookies_2 Grandmother baked cakes. Half of its was poppy, quarter with plum jam and 16 cheesecakes. How many cakes she baked in total?
  • Simple equation
    eq_1 Solve the following simple equation: 2. (4x + 3) = 2-5. (1-x)
  • Unknown number 11
    numbers_33 That number increased by three equals three times itself?
  • Equation
    serwisy_chemia_01 ?
  • Simple equation 9
    eq2 Solve the following equation: -8y+5=-9y+9
  • Equation 29
    eq222_18 Solve next equation: 2 ( 2x + 3 ) = 8 ( 1 - x) -5 ( x -2 )
  • Equation
    rovnice_3 Solve the equation: 1/2-2/8 = 1/10; Write the result as a decimal number.
  • Simple equation 10
    eq1_1 35= 7*3*x what is x?
  • Dropped sheets
    books_26 Three consecutive sheets dropped from the book. The sum of the numbers on the pages of the dropped sheets is 273. What number has the last page of the dropped sheets?
  • Negative in equation
    eq1_7 2x + 3 + 7x = – 24, what is the value of x?
  • Trees avg
    stromcek The worker planted 96 trees on Monday, 120 on Tuesday and 61 trees on Wednesday. How many trees did he plant on Thursday if he averaged 105 trees per day?
  • Unknown number
    nums Identify unknown number which 1/5 is 40 greater than one tenth of that number.
  • One-third
    krtek A one-third of unknown number is equal to five times as great as the difference of the same unknown number and number 28. Determine the unknown number.
  • Average
    avg The arithmetic mean of the two numbers is 71.7. One number is 5. Calculate the second number.