Let x = box office revenue in week 1, and y = box office revenue in week 2.
Since the revenues totalled $45 million, we have:
Since the revenue dropped 50% in the second week, we have:
the revenue in week 2 is half the revenue in week 1,
or, y = 0.5x.
This leads to the system
which has solution (30, 15). Thus, the revenues were $30 million in week 1 and $15 million in week 2.
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