120 invitees came for a rich man's wedding reception. Many had come in 50 vehicles parked in the compound of the rich man's bungalow. A boy counted the wheels of all these vehicles and announced that there were 139 wheels. Each car carried five visitors, each auto-rickshaw a couple and single persons came on bicycles. If 11 persons had walked to reception, how many auto rickshaws were parked there ?
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