The angles of the triangle are 3x–40, x+20 and 2x–10 then the value of x is_________.

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Solution

Sum of angles in a triangle $= 180^{0}$
i.e, $(3 x - 40) + (x + 20) + (2 x - 10) = 180^{0} 6 x - 30 = 180^{0} 6 x = 210^{0} x = 35^{0}$

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