Of 60 students, 43 take the bus, 30 take the train and 2 do neither. How many do both?
Answer and explanation
Correct answer: C. 15
- Step 1: Students doing at least one = 60 - 2 = 58; use total = A + B - both. Step 2. 43 + 30 - 15 = 58 = 60 - 2, so 15 do both. Answer: 15. Why not the others: 13, 12 and 24 each come from skipping the overlap or the 'neither' group in the working.
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