In a marketing survey involving 1,000 randomly chosen people, it is found that 630 use brand P, 420 use brand Q, and 210 use both brands. How many people in the survey use brand P and not brand Q?
A. 210 people
B. 420 people
C. 630 people
D. none of these
To answer this question you need to subtract
The equation P - Q = ? or 630-420=?
so you dont have too (630-420 is 210).
210 more people use brand p than brand q
:)
To solve this problem, we need to use the formula:
Total = P + Q - Both
where P is the number of people who use brand P, Q is the number of people who use brand Q, and Both is the number of people who use both brands.
Substituting the given values, we get:
Total = 630 + 420 - 210
Total = 840
This means that out of the 1,000 people surveyed, 840 use either brand P or brand Q or both. To find the number of people who use brand P but not brand Q, we need to subtract the number of people who use both brands from the number of people who use brand P:
P only = P - Both
P only = 630 - 210
P only = 420
Therefore, 420 people in the survey use brand P and not brand Q. The answer is (B) 420 people.