Which pageant was competed at by both Mariana Coromoto Jimenez Marinex and Pia Wurtzbach? 
Miss Universe 2015: Miss Universe 2015, the 64th Miss Universe pageant, was held on 20 December 2015 at The AXIS in Las Vegas, Nevada, United States. Miss Universe 2015:  Paulina Vega of Colombia crowned her successor Pia Wurtzbach of the Philippines at the end of the event.
i don't know