Instructions
Study the following diagram and answer questions based on it.
Solution
people who travel by train also travel by car = 20 + 10 = 30
people who travel by train also travel by bus = 50 + 10 = 60
people who travel by train also travel by car or bus but not by cycle = 30 + 60 - 10 = 80 (10 is common in both).
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