30. If (7x + 5)º and (x + 5)º are c...
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30. If (7x + 5)º and (x + 5)º are complementary angles, then find value of x RRB NTPC (Phase I) 2016 (1) 10 (2) 20 (3) 30 (4) 40

11th - 12th Class
Maths
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30. (1) According to the question, : [ begin{array}{r} 7 x+5+x+5=90^{circ} 8 x=80^{circ} x=10^{circ} end{array} ]
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