BA and BD are radii of the circle, so triangle ABD is isosceles. Then angles BDA and BAD are congruent, and the remaining (central) angle ABD has measure

Angles ABD and CBD are supplementary, so

and the answer is E.
The answer is 8 batches of cookies
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Simplify 123/8 then multiply 5/8 and x2 then add those two and subtract 6 sry if it's confusing