Table:
0
A
B
C
D
E
1
Model
Chassis code
Production time
Number built
Engine
2
300SEL
W109.015
09/65 - 12/67
2.369
3.0L M189 I6
3
300SEL
W109.016
12/67 - 01/70
2.519
2.8L M130 I6
4
300SEL 6.3
W109.018
12/67 - 09/72
6.526
6.3L M100 V8
5
300SEL 3.5
W109.056
08/69 - 09/72
9.483
3.5L M116 V8
6
300SEL 4.5
W109.057
05/71 - 10/72
2.533
4.5L M117 V8

Questions and formulas:
Question: What model has a number built smaller than 6.526, and the Chassis code w109.015?
Formula: LET(query1,LET(query1,FILTER(A1:E1,B1="w109.015"),SUMMARIZE(CHOOSECOLS(query1,1),SUMX(CHOOSECOLS(query1,4)))),FILTER(query1,CHOOSECOLS(query1,2)<6.526))
Formula2: LET(query1,LET(query1,FILTER(A2:E6,B2:B6="w109.015"),SUMMARIZE(CHOOSECOLS(query1,1),SUMX(CHOOSECOLS(query1,4)))),FILTER(query1,CHOOSECOLS(query1,2)<6.526))
Level: hard