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Subject :IMO    Class : Class 7

In the given figure, l ||m. If s and t be transversals such that s is not parallel to t, find the values of x + y.

(A) 205°

(B) 105°

(C) 75°

(D) 255°
How is the answer 255? I'm landing with 105.

Ans 1:

Class : Class 7
On transversal S, value of x =120 On transversal T, value of y= 135 So answer is 255

Ans 2:

Class : Class 8
x=180-60=120(corresponding angles are equal) y= 180-45=135 (corresponding angles are equal) x+y=120+135=255

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