Finding the Number of Red Marbles

Very Easy Data Sufficiency Determining Sufficiency

John has a collection of marbles consisting of red, blue, and green marbles. The total number of marbles is 30.

To determine the number of red marbles, we consider the following statements:

Statement 1: The number of blue marbles is twice the number of red marbles.

Statement 2: The number of green marbles is 10 less than the number of blue marbles.

How many red marbles does John have?

Statement 1 alone is sufficient, but Statement 2 alone is not sufficient.

Statement 2 alone is sufficient, but Statement 1 alone is not sufficient.

Both statements together are sufficient, but neither statement alone is sufficient.

Each statement alone is sufficient.

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