Question 883082
The question is not clearly worded, so I will have to make some assumptions:
56 games at 29.4 points.  The 57th game was 46 points.  The average desired is 30 points over 57 games.
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56 * 29.4 = 1646.4
To average 30 points, he would need a total of 57 * 30 = 1710
Therefore, he would have needed 64 points for an average of 30.
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If, however, he has already played 57 games (1646.4 + 46 = 1692.4) and he is looking for a 30 average of 58 games, he would need 58*30, or 1740 points.  He could do this by scoring 48 points in his 58th game.