exam Maths Puzzle Numerical Ability

s=0.5(70-25)40=
can u solve this for me and explain it please

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Construction:

Carpentry: Two sides of a sloped ceiling meet at an angle of 105.5 degree. If the distances along the sides to the opposite walls are 11.0 and 13.0 ft, what lengt C - S
D = ----------- (for s) Depreciation
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