Question

see question no 3 and answer

Answer 1

see second figure properly there is a linear pair 40 + x is equals to 180.
now, x = 180-40
=140
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Answer 2

i) 2x+x+30 = 180 (linear pair)
3x = 150
x = 50

ii) 40+x = 180 (linear pair)
x= 140

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