Over Riding a Presidential Veto?

(1) ume that 420 members of the House are available to vote. How many votes are necessary to make up a majority, which is anything over 1/2? (2) If 90 members of the Senate are available to voate, how many votes would constitue a majority. (3) How many vpates from a group of 420 members of athe house would be necessary to overturn a veto? (4) How many votes from a group of 90 members of the senate would be necessary to overturn a vote?