No, the DJM-600 rack mount does not fit the DJM-700 mixer. While both mixers may have similar dimensions, their mounting points and designs are different, so the rack mount for the DJM-600 is not compatible with the DJM-700. For the DJM-700, you would need a specific rack mount designed for that model.
The number 684 is between the hundreds of 600 and 700. Specifically, it is greater than 600 and less than 700. Thus, the two hundreds that 684 is between are 600 and 700.
$600 to $700
1800
700 billion + 600 billion + 10 billion = one trillion, three hundred ten billion
700
700
700
Aprox $600-$700, parts and labor.
600 as it is 49 away from 600 but is 51 away from 700
600
700
600
600 as 68 is nearer 100 than 0
700
700
1200/2=600
600