Posted by **Anonymous** 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 -
**Ms. Sue**, Thursday, December 13, 2012 at 9:16pm
4 * 21 = 84

12 + 18 + 28 = 58

84 - 58 = ?

- Math -
**Anonymous**, Thursday, December 13, 2012 at 9:27pm
26!

- Math -
**Ms. Sue**, Thursday, December 13, 2012 at 9:36pm
Yes!

- Math -
**Kay**, Monday, March 4, 2013 at 3:29pm
12+18+28+x/4=21 58+x=84 x=84-58=26

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**gggggggggggg**, Saturday, November 26, 2016 at 6:03pm
26

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**Owen**, Thursday, December 8, 2016 at 5:41pm
26!!!

- Math -
**Anonymous**, 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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