In a survey related to United Nation Security Council, 58% of those asked were in favour of at least one of the proposals I, II and III. 60% of those asked favoured proposal I, 25% of them favoured proposal II, and 15% of them favoured proposal III. If 4% of them favoured all three proposals, then what percentage of those asked favoured more than one of the three proposals?
In a survey related to United Nation Security Council, 58% of those asked were in favour of at least one of the proposals I, II and III. 60% of those asked favoured proposal I, 25% of them favoured proposal II, and 15% of them favoured proposal III. If 4% of them favoured all three proposals, then what percentage of those asked favoured more than one of the three proposals? Correct Answer 38%
Calculation:
⇒ Let the total number of people surveyed be 100.
⇒ Number of people in favour of at least one proposal = 58
From Venn diagram:
⇒ Number of people in favour of exactly two proposals = x + y + z
⇒ Number of people in favour of all three proposals = 4
⇒ Number of people in favour of only proposal I = 60 - (x + y + 4)
⇒ Number of people in favour of only proposal II = 25 - (x + z + 4)
⇒ Number of people in favour of only proposal III = 15 - (y + z + 4)
According to the question:
⇒ 58 = 60 - (x + y + 4) + 25 - (x + z + 4) + 15 - (y + z + 4) + (x + y + z) + (4)
⇒ 58 = 100 - (x + y + z) - 8
⇒ (x + y + z) = 34
⇒ Number of people who favoured more than one proposal = Number of people in favour of exactly two proposals + Number of people in favour of all three proposals
⇒ x + y + z + 4
⇒ 34 + 5 = 38
⇒ Required percentage = 38%
Additional Information
Three Overlapping Sets Region
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