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Subject :IMO    Class : Class 7

In the figure, PQ is parallel to ST. AB is a straight line. Find ∠BST.

A 110°
B 125°
C 152°
D 98°

I din't understand this question

Ans 1:

Class : Class 7
i agree

Ans 2:

Class : Class 7
option a is correct as angle pqs is epual to angle qsa +angle ast (alternate interior angle)=70 98=28+x x=98-28 x=70 ast+tsb=180(straight angle) 70+y=180 y=180-70 y=110

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