Answer:
The missing number that makes the equation true is 23.
Step-by-step explanation:
29 + 20 = 15 + 11 +?
First, add 29 and 20. The sum is 49.
49 = 15 + 11 + ?
Next, add 15 and 11. The sum is 26.
49 = 26 + ?
Now, subtract 26 from 49. The difference is 23.
49 = 26 + 23
This is all that you technically need to do, but you can go ahead and add 26 and 23 if you'd like. This will give you a sum of 49 as well.
49 = 49
Hence, the missing number is 23.
