Here’s another one, and I DO have the answer!

Many answers work correctly: 40, 52, 96. There may be more.
I find 40 to be the weakest possibility due to the first statement (equation) not having a preceding statement (equation).
Yeah, I told you it Did! 1+4=5 and 5+0=5
Zero
is the prior total of the equation we don't see, but it is there and the only answer that makes sense. 0
 
40
Following the sequence shown
1+4 =5
5 +2+5 =12
12 + 3+6 =21
21+8+11=40

The sequence doesn't include the + after the 1st. 5 nor after the 12 or 21. Without the + 's I suppose any combination could be imagined. I took the presentation of the sequence to be the logical way to solve this.
 
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