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Posted by on Thursday, December 13, 2012 at 9:13pm.

If the average of these four numbers is 21, find the missing number.

12, 18, 28, ?



What is the missing number and why

  • Math - , Thursday, December 13, 2012 at 9:16pm

    4 * 21 = 84

    12 + 18 + 28 = 58

    84 - 58 = ?

  • Math - , Thursday, December 13, 2012 at 9:27pm

    26!

  • Math - , Thursday, December 13, 2012 at 9:36pm

    Yes!

  • Math - , Monday, March 4, 2013 at 3:29pm

    12+18+28+x/4=21 58+x=84 x=84-58=26

  • Math - , Saturday, November 26, 2016 at 6:03pm

    26

  • Math - , Thursday, December 8, 2016 at 5:41pm

    26!!!

  • Math - , Thursday, December 15, 2016 at 8:01am

    If the average of these four numbers is 21 find the missing number 12,18,28,_,_,_.

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