jackg0101
Advik: Most stores in our town with fewer than five employees are owned by women. Every antique store in our town has fewer than five employees. However, none of the antique stores in our town are owned by women.
If Advik's statements are true, then it must also be true that most of the stores in Advik's town that
A. have fewer than five employees are not antique stores
B. are not owned by women are antique stores
C. have five or more employees are not owned by women
D. are not antique stores are owned by women
E. are owned by women have fewer than five employees
Given:
Most stores in our town with fewer than five employees are owned by women. Say there are 20 stores with fewer than 5 employees. At least 11 of these are owned by women. Note here that we have no idea about how many stores there are that have more than 5 employees.
Every antique store in our town has fewer than five employees. So all antique stores are a part of those 20.
However, none of the antique stores in our town are owned by women.But none of the antique stores are a part of that 'at least 11'.
It works, right? It is possible that exactly 11 of those 20 stores are owned by women and all antique stores are a part of the leftover 9. Or say 12 of those 20 stores are owned by women and all antique stores are a part of the leftover 8 etc.
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If Advik's statements are true, then it must also be true that most of the stores in Advik's town that
A. have fewer than five employees are not antique storesMost of the stores that have fewer than five employees are not antique stores.
This is correct.
"stores that have fewer than five employees" - 20 stores assumed above
So this statement says that "Most of the 20 stores are not antique stores."
This is correct. We saw above that antique stores can be at most 9 of the 20 stores.
B. are not owned by women are antique storesMost of the stores that are not owned by women are antique stores.
We don't know how many overall stores are not owned by women i.e. are owned by men.
As we see in the Venn diagram above, number of stores owned by men is unknown.
C. have five or more employees are not owned by womenMost of the stores that have five or more employees are not owned by women
We don't know how many stores have 5 or more employees.
D. are not antique stores are owned by womenMost of the stores that are not antique stores are owned by women
We don't know how many stores are outside the green antique stores circle. We don't know how many stores have 5 or more employees and who owns them. Are most of them owned by women or men, we cannot say. Either is possible.
E. are owned by women have fewer than five employeesMost of the stores that are owned by women have fewer than five employees.
Again, we don't know how many stores have 5 or more employees and who owns them. As per our example, women own 11 stores with less than 5 employees. Women could own no store with 5 or more employees or they could own 100 stores with 5 or more employees.
Answer (A)I have discussed how using SETS can help in solving CR questions in the following videos:https://youtu.be/0uqq17WCJiEhttps://youtu.be/XCBp62o70Eghttps://youtu.be/XCBp62o70Eg