What's the final tangential velocity of the mill wheel?

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A mill wheel 400 kg and radius 2.50 m, with 8 blades diametrically opposed to each other of 3.00 kg each, is driven by a jet of water to a tangential velocity of 5.00 m / s. If a rock off 4 blades diametrically opposed, what will be the final tangential velocity of the treadmill? My question is: should take into account the inertial moment of the blades or is negligible for the resolution of this exercise?
 
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This problem is not about what happens to the wheel when the blades broke off, rather what happens after they broke off. The loss of their mass will adjust the inertia of the entire wheel. Since there is no info about the size of the blades, I would assume that they are positioned at the given radius of the wheel, so the "new" wheel is 12 kg less massive. Figure out the new moment of inertia and proceed.

There must be more information for this problem than you gave here.