If lines m and n in the figure are parallel, what is y?

[divyaannc]

In manhattan prep 5th edition(Red book), Geometry guide, Page no 97 and 98 contains a question regarding the value of y?

My doubt is, Cant y=48+92= 140 degrees?

Here y is exterior angle. So as per the rule an exterior angle equals sum of two non adjacent interior angles. So y=48+92=140. But here 140 is not the answer. 48 degrees is the answer.

I am really confused regarding the exterior angle rule?

Can anyone clear my doubt?

[RonPurewal]

Hello,

Per the forum rules, could you please upload the diagram(s) from the problem?
(We don't always have access to the books while posting on the forum"”and, more importantly, this post will have limited use to future readers without the diagram(s).)

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Thanks.