exam Maths Puzzle Numerical Ability

I would like to know how the auther came up with the answer of 6. I came up with 3.

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exam Other Question

The measure of the supplement of an angle added to the measure of the compliment of that same angle is 210. Find the measure of the angle.

What is the supplement? An issocles triagle had a perimeter of 370mm.the base of the triangle is 40mm longer than the two equal side.What is the length of each side.