Big-Book-test-1-section-1-question-1

Can someone please explain to me the approach used here using the math strategy?

Big-book-test-1-section-1-question-1

Can you first explain how did you approach it ? Or provide any context on your approach …

Where do we find answers to Big Book questions?I could not find it.

at the end of each test , there is an answer key!

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Is A the answer ?
I feel it should be A