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D

Stimulus -

Out of first 36, 12 were choc chip

Half of remaining were choc chip

Statement 1 - 60 total

First 36 - 12 are CC
REMAINING 24 - 12 are CC

Total cc = 24

1 is sufficient.

Statement 2 - of all cookies, final proportion was 2/5 for cc cookies. This includes 12 of 36 cookies and 0.5x of x more cookies

(12+0.5x)/(36+x) = 2/5

That’s one linear equation in one variable therefore x can be found.

2 is sufficient.

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