A radioactive isotope X decays simultaneously by two ways `alpha` and `beta` decay. The decay constants of `alpha` and `beta` decays are `lambda_(1)` and `lambda_(2)` and the products formed are Y and Z respectivley. Both Y and Z are stable. Initially. there was no presence of Y and Z in the sample. The process of `alpha` decay stops fater time `t_(0)`. Find the ratio of mass of Y to mass of Z in the sample at time `2t_(0)` the molar masses of Y and Z are `M_(y)` and `M_(z)` respectively.