Answer:
Sarah spent $15.75 at the movies on a ticket and snacks.
She earned $40 babysitting.
She bought a book for $9.50.
She has $34.75 left.
=> The amount of money she started with:
A = 34.75 + 9.5 - 40 + 15.75 = 20$
Hope this helps!
:)
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