Table:
0
A
B
C
D
E
F
1
Number
Previous Number(s)
Previous Class
Converted
Withdrawn
Disposal
2
31 (1st)
68383
J66
1952
1959
Scrapped (1959)
3
32 (1st)
68370
J66
1952
1962
Scrapped (1962)
4
33
68129
Y4
1952
1963
Scrapped (1964)
5
34
68088
Y7
1952
1952
Preserved
6
35
68668
J92
1952
1952
Scrapped (1952)
7
36
68378
J66
1952
1959
Scrapped (1959)
8
37
68130
Y1
1953
1956
Scrapped (1956)
9
38
68168
Y3
1953
1959
Scrapped (1959)
10
39
68131
Y1
1953
1963
Scrapped (1963)
11
40
68173
Y3
1953
1964
Scrapped (1964)
12
41
68177
Y3
1953
1963
Scrapped (1963)
13
42
68178
Y3
1953
1960
Scrapped (1960)
14
43
68532
J69
1959
1959
Scrapped (1959)
15
44
68498
J69
1959
1962
Scrapped (1962)
16
45
68543
J69
1959
1962
Scrapped (1962)

Questions and formulas:
Question: How much Converted has a Number of 35, and a Withdrawn smaller than 1952?
Formula: ROWS(UNIQUE(FILTER(D1, (A1=35)*(E1<1952))))
Formula2: ROWS(UNIQUE(FILTER(D2:D16, (A2:A16=35)*(E2:E16<1952))))
Level: medium
Question: How much Withdrawn has a Number of 42, and a Previous Number(s) larger than 68178?
Formula: LET(query1,LET(query1,FILTER(A1:F1,A1=42),SUMMARIZE(CHOOSECOLS(query1,5),SUMX(CHOOSECOLS(query1,2)))),FILTER(query1,CHOOSECOLS(query1,2)>68178))
Formula2: LET(query1,LET(query1,FILTER(A2:F16,A2:A16=42),SUMMARIZE(CHOOSECOLS(query1,5),SUMX(CHOOSECOLS(query1,2)))),FILTER(query1,CHOOSECOLS(query1,2)>68178))
Level: hard
Question: Which Withdrawn has a Previous Class of j69, and a Previous Number(s) smaller than 68532, and a Converted larger than 1959?
Formula: LET(query1,LET(query1,FILTER(A1:F1,(C1="j69")*(D1>1959)),SUMMARIZE(CHOOSECOLS(query1,5),SUMX(CHOOSECOLS(query1,2)))),FILTER(query1,CHOOSECOLS(query1,2)<68532))
Formula2: LET(query1,LET(query1,FILTER(A2:F16,(C2:C16="j69")*(D2:D16>1959)),SUMMARIZE(CHOOSECOLS(query1,5),SUMX(CHOOSECOLS(query1,2)))),FILTER(query1,CHOOSECOLS(query1,2)<68532))
Level: hard