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'Balancing the Books' printed from http://nrich.maths.org/
A tourist attraction, which opens every day, needs 30 000 visitors per day on average to break even. Last week there were 120 000 visitors.
What is the number of visitors needed this week to break even over the two-week period?
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which challenges you to use similar mathematical ideas.
This problem is taken from the UKMT Mathematical Challenges.