The capacity of the first bowl is 3/4 x 600 = 450 marbles.
The total capacity of both bowls is 450 + 600 = 1050 marbles.
Therefore, the total number of marbles held by both bowls combined is 1050.
#### 1050
The answer is: 1050
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
If the second bowl has a capacity of 600 marbles and the first bowl has a capacity equal to 3/4 of the second bowl's capacity, what is the total number of marbles held by both bowls combined?

### Answer:
