exam Maths Puzzle Numerical Ability

-1/7 + 4/5 =

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I have a problem with a question. The question is- One of the angles of a triangle measures 45 degrees, another angle of the triangle measures 72 degrees. What is the measure of the third angle of the triangle?

HELP! (a.s.a.p. please =])
Solve:

x=0.25[200,000-0.10(200,000-x)]