Identify the missing number
78,20,?,56,23
The missing number is 45.
To get this answer:
- Subtract the second number from the first: 78 - 20 = 58
- Subtract the fourth number from the fifth: 23 - 56 = -33
- Find the difference between these two results: 58 - (-33) = 91
- Divide by 2, since there are two missing numbers in this sequence: 91 / 2 = 45.