This question type shows a total value resulting from a combination of multiple sets and mutiple single units without sets.
These questions are common in Paper 2 of P6 exam papers.
Calculator usage is allowed.
Ivan is a fishmonger at the local market.
Each customer that buys 3 fish will get one free.
Each fish is sold at $12.
Last week, his customers either bought 1 or 3 fish.
Ivan collected $888 from the sale of his fish last week and gave away 21 free fish.
How many of his customers bought only 1 fish?

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