How many people chose A?
In a survey people had to choose either A, B, C or D.
The percentage of people that chose B, C and D are shown here:
B- 25%
C- 35%
D- 30%
You are also told that 150 people chose B. How many chose A?
So first of all lets see what percentage of people chose A. We know that all the %s must add up to 100, so the percentage of people who chose A can be worked out by:
100 - (25 + 35 + 30) = 100 - 90 = 10
So 10% of people chose A.
Now lets look at how many people 10% is, we know that 150 people chose B, and so 25% of the sample is 150 people. So there must have been 150 x 4 = 600 people who answered the survey as 25% x 4 = 100%.
So now we work out 10% of 600, which equals 60.
So, 60 people chose A.
RB
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