If there is nobody who visited only London and Singapore, how many people visited only Hong Kong?
Explanation:
Consider the solution to first question of this set.
x + y + z = 60.
Since no pilgrim visited only London and Singapore, y = 0
∴ x + z = 60.
Also, the number of toursits who visited only Hong Kong is denoted by b.
b + (x + z) + 30 = 190
∴ b + 60 + 30 = 190
∴ b = 100
Hence, 100 people visited only Hong Kong
Hence, option (e).
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