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Each of the 600 cars in a certain parking lot is either a hatchback or a sedan. How many of the hatchbacks are electric?

(1) 75% of all cars in the parking lot are electric.
(2) The number of electric sedans is 25% more than the number of electric hatchbacks.
Explanation:

Let the number of electric hatchbacks be H.
Let the number of electric sedans be S.
The total number of cars (electric + non-electric) = 600
We need to find whether the value of H can be determined.

Statement (1)

H + S = 0.75(600) (Equation I)

Since we have 1 equation with 2 unknown variables, it is NOT possible to determine the exact value of H. Hence, Statement (1) is insufficient.

Statement (2)

S = 1.25H (Equation II)

Since we have 1 equation with 2 unknown variables, it is NOT possible to determine the exact value of H. Hence, Statement (2) is insufficient.

As Statement (1) alone as well as Statement (2) alone is insufficient to answer the question, we need to now combine the two statements.

Statement (1) and Statement (2) combined

From Equation I and Equation II, we have 2 equations with 2 unknown variables.

It is possible to determine the exact value of H. Hence, Statement (1) and Statement (2) combined are sufficient.

C is the correct answer choice.
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