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Answer:
since p||q and transversal l intersect them
a+60°=180° (co-interior angles)
a=180°-60°
a=120° Ans
again, if l||mand transversal q intersect them
then
a=d ( alternate exterior angles)
d=120° Ans
now
b+d = 180° (linear pair angles)
b = 180°-120°
b = 60° Ans
now,line m and q intersect each other then
b=c ( vertically opposite angles)
c= 60° Ans