A survey of n people in the town A found that 50% of them prefer Brand X. Another survey of 100 people in the town B found that 60% prefer Brand X. In total, 55% of all the people surveyed together prefer Brand X. What is the total number of people surveyed?
Created: 6 years ago |
Updated: 3 years ago
best des
Total = n + 100
Now, total × 55% = n × 50% + 100× 60%
( n + 100) ×.55 = . 50n + 60
.55n + 55 = .50n + 60
.05n = 5
n = 5/.05 = 100
Total = n + 100 = 100 + 100 = 200
Md Azizur Rahman
Founder of Satt
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