Question
In a small town, 50% of the people like fishing, 70%
like hiking, and 30% like both. If the remaining 21 people don't like either activity, how many people are in the town?Solution
ATQ, Let the total number of residents be 100x Residents who enjoy both swimming and running = 0.3 Γ 100x = 30x Residents who enjoy only swimming = 50x - 30x = 20x Residents who enjoy only running = 70x - 30x = 40x Residents who enjoy at least one activity =20x + 40x +30x = 90x ATQ, 
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