Table:
0
A
B
C
D
E
1
Class to 1928
Class from 1928
Seats
Quantity
Year(s) of Manufacture
2
Di-26
Cid-26
66
77
1927/28
3
Di-27
Cid-27; Ciu-27/28
66
440
1927/28
4
BCi-28
BCi-28
15/34
449
1928/29
5
Ci-28
Ci-28
58
1744
1928/29
6
CDi-28
CCid-28; CCiu-28
29/29
40
1928
7
Bi-29
Bi-29
38
1632
1929/30
8
BCi-29
BCi-29
15/34
500
1929/30
9
Ci-29
Ci-29
58
450
1929/30
10
Ci-30
Ci-30
58
194
1929/30

Questions and formulas:
Question: What's the sum of Quantity for the Class of 1928 of CI-30?
Formula: SUMIFS(D1,B1,"ci-30")
Formula2: SUMIFS(D2:D10,B2:B10,"ci-30")
Level: easy
Question: What Class to 1928 has the Quantity smaller than 440 and Seats of 29/29?
Formula: LET(query1,LET(query1,FILTER(A1:E1,C1="29/29"),SUMMARIZE(CHOOSECOLS(query1,1),SUMX(CHOOSECOLS(query1,4)))),FILTER(query1,CHOOSECOLS(query1,2)<440))
Formula2: LET(query1,LET(query1,FILTER(A2:E10,C2:C10="29/29"),SUMMARIZE(CHOOSECOLS(query1,1),SUMX(CHOOSECOLS(query1,4)))),FILTER(query1,CHOOSECOLS(query1,2)<440))
Level: hard