Table:
text: 1980–81 Northern Premier League
Final table
Final table
Position_ Team Played Drawn Lost Goals_For Goals_Against Goal_Difference Points_1
1 Runcorn 42 7 3 99 22 +77 71
2 Mossley 42 7 11 95 55 +40 55
3 Marine 42 10 10 66 41 +25 54
4 Buxton 42 7 14 64 50 +14 49
5 Gainsborough Trinity 42 13 12 80 57 +23 47
6 Burton Albion 42 8 15 63 54 +9 46
7 Witton Albion 42 8 15 70 62 +8 46
8 Goole Town 42 16 12 56 50 +6 44
9 South Liverpool 42 6 17 59 64 −5 44
10 Workington 42 13 14 57 48 +9 43

Question: What are the average goals for the team that has +40 in goal difference with points 1 greater than 55 in the 1980–81 Northern Premier League?