A liquid at ${30}^{0}C$  is poured very slowly into a calorimeter that is at temperature of  ${110}^{0}C$.The boiling temperature of the liquid is ${80}^{0}C$ .It is found that the first 5 g of the liquid completely evaporates. After pouring another 80 g of the liquid the equilibrium temperature is found to be ${50}^{0}C$  .The ratio of the latent heat of the liquid to its specific heat will be …….  ${ }^{0}C$ ( Neglect the heat exchange with surrounding)