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There will be eight marbles on the 9th line
Angle a is directly opposite from a 40 degree angle, so a=40. Then we can find b since the sum of the angles of all triangles is 180 and there is a right angle in there along with angle a:


Last, to find c we just notice that it is supplementary with an angle of measure 65, so:


So our angles are a=40, b=50, c=115.
Answer:
Just divide the numbers by 10 and then multiply the quotient by 2. hope this helped
I might not be right but i think it’s 104