Table:
0
A
B
C
D
E
F
G
1
Class
Ship Name
Origin
Hull Numbers
Service years
Previously
Note
2
Ahmad Yani Class (FFGHM)
KRI Ahmad Yani
Netherlands
351
1986–Present
RNN HNLMS Tjerk Hiddes(F804)
Reportedly still active as of 2009
3
Ahmad Yani Class (FFGHM)
KRI Slamet Riyadi
Netherlands
352
1986–Present
RNN HNLMS Van Speijk(F802)
Reportedly still active as of 2009
4
Ahmad Yani Class (FFGHM)
KRI Yos Sudarso
Netherlands
353
1987–Present
RNN HNLMS Van Galen (F803)
Reportedly still active as of 2009
5
Ahmad Yani Class (FFGHM)
KRI Oswald Siahaan
Netherlands
354
1987–Present
RNN HNLMS Van Nes (F805)
Reportedly still active as of 2012
6
Ahmad Yani Class (FFGHM)
KRI Halim Perdanakususma
Netherlands
355
1989–Present
RNN HNLMS Evertsen (F815)
Reportedly still active as of 2009

Questions and formulas:
Question: what is the maximum number of hull numbers?
Formula: MAX(D1)
Formula2: MAX(D2:D6)
Level: easy
Question: who is the class where note is reportedly still active as of 2012?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:G1,G1="Reportedly still active as of 2012"),1))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:G6,G2:G6="Reportedly still active as of 2012"),1))
Level: medium
Question: what is the maximum number of hull nunbers where ship name is kri yos sudarso?
Formula: MAXIFS(D1,B1,"KRI Yos Sudarso")
Formula2: MAXIFS(D2:D6,B2:B6,"KRI Yos Sudarso")
Level: easy