It is 20
The even numbers between 18 and 30 are 20, 22, 24, 26, and 28.
16, 18, 20, 21, 22, 24
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
18 = 16 + 2 = 1*24 + 0*23 + 0*22 + 1*21 + 0*20 = 100102.
10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 25
22 is halfway between 19 and 25 because 19+3=22, and 22+3=25.
22
it is: 22
22
1/2(64+22) = 43
22(13+31)/2
42 is exactly halfway between 32 and 52.42
22
20 is the median between 18 and 22.
It is: (365+1025)/2 = 695
The missing number is 18
18, 20, 22, 24, 26, 28