DAY 85

Comment

26 plus twice 29 is 26 + 29 + 29.
29 plus twice 26 is ...

Answer

3.

Readers' methods

Luke S, Sandy Lane:
29+29=58 and 26+26=52.
There is 6 more units in 58.
To make 26 and 29 the same we add 3 of the original 6 on.
The left over amount is 3.