Table:
0
A
B
C
D
E
F
1
Class
Type
No. built (Converted*)
Year built (Converted*)
No. range
Withdrawn
2
Class 420
4Big
18
1965-66
7031-7048
1986
3
Class 420
4Big
10
1970
7049-7058
1988
4
Class 421
4Cig
36
1963-66
7301-7336 (later 1101-1136)
1993
5
Class 421
4Cig
102
1970-74
7337-7438 (later 1201-1300)
1993
6
Class 421
8Mig
2*
1983*
2601–2602
1983

Questions and formulas:
Question: Tell me the number range for 1965-66
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,D1="1965-66"),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F6,D2:D6="1965-66"),5))
Level: medium
Question: Tell me the year built for withdrawn of 1983
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,F1=1983),4))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F6,F2:F6=1983),4))
Level: medium
Question: Tell me the year built for number built of 10
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,C1=10),4))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F6,C2:C6=10),4))
Level: medium