An Art exhibition charges an entry ticket £x per adult and £y per child. It runs for two nights. On the first night, the amount earned were £490, when 120 children and 50 adults attended it. On the second night, the amount earned were £305, when 90 children and 25 adults attended it. Construct simultaneous equations and find the cost of an adult ticket (£x) and a child ticket (£y).
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