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Add them together and divide by 6.
add all three number together and then divide by three (because there's three numbers) 21+6=27, 27+9=36, 36/3=12 12 is the answer.
The LCM of 6, 9, and 21 is 126
21 times 9 plus 6 is equal to 195.
6+8+7= 21 21/3 = 7 The average is 7.
Well, darling, if you add 5, 7, and 9 together, you get 21. And since there are three numbers, you divide 21 by 3 to get an average of 7. So, the average of 5, 7, and 9 is 7. Hope that clears things up for you, sweetie!
The GCF is 3.
The average is 15.
9/6 = 21/n3/2 = 21/n Since 3 x 7 = 21, then n must be 14 (2 x 7) and we have:3/2 = 21/14 or 9/6 = 21/14.
LCM(9, 6, 21, 14) = 126
9-6 = 3 21-13= 8 8x3 = 24
Are you trying to say 17 + 6 + (7-9) ? = 21