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The revenue for a sandwich shop is directly proportional to its advertising budget. When the owner spends $2,000 a month on advertising, the revenue was 120,000. If the revenue is now 180,000, how much is the owner spending on advertising?
The profit on a watch is given by the number of watches sold per day. How many watches were sold on a day when there was a $50 loss?
The keyboard of a piano has seven full octaves plus two extra white keys and one extra black key. There are 36 black keys on a piano. How many black keys are there in one octave?
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