A survey of n people in the town of X found that 50% of them prefer Brand A. Another survey of 100 people in the town of Y found that 60% prefer Brand A. In total, 55% of all the people surveyed together prefer Brand A. What is the total number of people surveyed ?
Solution
Correct Answer: Option B
Solution:
যদি Total number of people in survey = x হয় তবে A = 100 - x
প্রশ্নমতে, (100 - x) 50% + (100 \( \times \) 60%) = x \( \times \) 55%
=> 5000 - 50x + 6000 = 55x
=> 11000 = 105x x = 200
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