On a crossing, when the green lights are on (during one cycle), the vehicles which cross the green light comprise 50%

On a crossing, when the green lights are on (during one cycle), the vehicles which cross the green light comprise 50% four-wheelers, 35% two-wheelers and the rest three-wheelers. If 30 three-wheelers cross the light, how many four-wheelers and two-wheelers cross during same period?
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