Concept: The question tests on the area of Arithmetic(DS).
Let the number of individual memberships = x. Then the number of partner memberships = 3x.
Also let the cost of each partner membership = y
Then Total Revenue = 375x + 3xy = x (375 + 3y)
Statement 1: The cost of each partner membership was $500.
This gives us the value of y, but we do not have information on the number of individual or partnership members.
Therefore Statement 1 Alone is Insufficient. Answer options could be B, C or E.(Insufficient)
Statement 2: The revenue from individual memberships was 1/5 of the total revenue from all memberships
375x = 1/5 * (375x + 3xy)
5 * 375x = 375x + 3xy
4 * 375x = 3xy
y = 4 * 125 = 500
Again from this statement, we do not get any information on the number of individual or partnership members.
Therefore Statement 2 Alone is Insufficient. Answer Options could be C or E.(Insufficient)
Combining Both Statements:
We get the same information for y from both the statements as shown.
Therefore Both Statements together are Insufficient.