Some Basic Concepts of Chemistry Part 3

0.25 g of an organic compound "A" containing carbon, hydrogen and oxygen was analysed using the combustion method. There was an increase in mass of CaCl2 tube and potash tube at the end of the experiment. The amount was found to be 0.15 g and 0.1837 g , respectively. The percentage of oxygen in compound A is ____ \%. (Nearest integer)
(Given: molar mass in gmol−1H:1,C:12,O:16 )