NEET 2020 Model Question Paper 3

Three blocks A, B and C are lying on a smooth horizontal surface, as shown in the figure. A and B have equal masses, m while C has mass M. Block A is given an in itia l speed v towards B due to w hich it collides with B perfectly inelastically. The combined mass collides with C, also perfectly inelastically, 5/6th of the initial kinetic energy is lost in whole process. What is value of M/m ?