A system is taken from state a to state c by two paths adc and abc as shown in the figure. The internal energy at a is U = 10 J. Along the path adc the amount of heat absorbed 8Q, = 50 J and the work done 8W, = 20 J whereas along the path abc the heat absorbed 8Q = 36 J. The amount of work done along the path abc is [NEET Kar. 2013] (a) 6 J (c) 12 J b (b) 10 J (d) 36 J