Sri Lanka parliament have 225 seats.
Out of 225 seats, 196 members will be selected from the general election in 22 electoral districts of Sri Lanka. Balance 29 members are allocated proportionally for each party based on the number of votes they get from the election and the parties can appoint an independent person as a member of the parliament.
The current parliament need to be resolved on or before August 2020. However, since none of the parties have parliamentary majority seats, it is most likely to dissolve the parliament very soon after finishing the presidential election in November 2019.