Table:
text: 1987–88 FA Cup
First round proper
First round proper
Tie_no Home_team Score Away_team Date_
21 Bristol Rovers 6–0 Merthyr Tydfil 14 November 1987
22 Northampton Town 2–1 Newport County 14 November 1987
23 Worcester City 1–1 Yeovil Town 14 November 1987
Replay Yeovil Town 1–0 Worcester City 17 November 1987
24 Altrincham 0–2 Wigan Athletic 14 November 1987
25 Southend United 0–0 Walsall 14 November 1987
Replay Walsall 2–1 Southend United 17 November 1987
26 Bognor Regis Town 0–3 Torquay United 14 November 1987
27 Scunthorpe United 3–1 Bury 14 November 1987
28 Halesowen Town 2–2 Kidderminster Harriers 14 November 1987
Replay Kidderminster Harriers 4–0 Halesowen Town 16 November 1987
29 York City 0–0 Burton Albion 14 November 1987

Question: What was the tie number when Wigan Athletic were the away team in the 1987/88 FA Cup first round?