In the equation 40+70+?=360, they are trying to find the last angle.
First they would add 40 and 70, which is 110.
So 110+?=360
360-110=?
360-110=250
Well this is wrong, because every angle in a triangle adds up to 180 degrees.
If you are adding up the angles in a quadrilateral, only then it adds up to 360 degrees.
So they did everything right, but they didn't use the right "total degrees"
This is what it was supposed to look like.
40+70+?=180
110+?=180
180-110=?
180-110=70
?=70
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