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
To find the average of 5, 7, and 9, you add the numbers together and then divide by the total number of values. In this case, the sum of 5, 7, and 9 is 21. Since there are three numbers, you divide 21 by 3 to get the average, which is 7.
21 times 9 plus 6 is equal to 195.
6+8+7= 21 21/3 = 7 The average is 7.
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