16.In the figure AB ∥ CD the value of 2x - y is
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x=50 (alternate interior angle)
it is alternate to angle APQ
120+a = 180 (angles forming on straight line)
therefore , a=120-180
therefore , a=60
50+60+y = 180 (angles in a triangle)
therefore , 110+y=180
therefore , y=180-110
therefore , y=70
x=50 and y=70
therefore 2x-y
=2×50-70
=100-70
=30
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