22
Average of 21, 24, 21 and 23 = (21+24+21+23)/4 = 22.25
5
Just over 20 18 + 19 + 21 + 23 = 81 81 / 4 (numbers) = 20.25
(-18-23+20)/3= (-21)/3=-7
23 + 17 = 40 to maintain an average of 21 you would need 63 for a 3 week period. So you would need 23 more on the third week to maintain a 21 call average. (23+17) = (40 - 63) = 23 :]
21*23 = 483 21 * 1 = 21 23 * 1 = 23 23 * 1 * 21 = 483 :) Hope it helped!
First, the three numbers must be added:20 + 22 + 23 = 65Then the sum must be divided by three, because that is how many numbers there are:65 / 3 = 21 1/3The average of 20, 22, and 23 is 21 1/3.
23
23 + 21 = 44
23/21 = 12/21
C+ (-2)= 21= 21+2= 23+ (-2)= 21 23+ (-2)= 21 is the same as 23- 2= 21
The improper fraction 23/21 can be rewritten as 1 2/23 as a mixed fraction (one and two over twenty-three).