Let x = market share of Cole Vision (%), y = market share of Lens Crafters, and z = market share of Pearle Vision.
The statement "Together, they accounted for 66% of total market sales" tells us that
The statement "The combined share of Cole Vision and Lens Crafters was twice the share of Pearle Vision" tells us that
Finally, we are told that "Lens Crafters' share was 2% less than the combined share of Cole Vision and Pearle Vision." In other words,
Solving the system of the above three equations in three unknowns gives the solution:
Thus the market shares are: Cole Vision: 12%, Lens Crafters: 32%, Pearle Vision: 22%
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