Table:
0
A
B
C
D
E
F
1
Month Sequence
Numbered Month
Month Name
Regular Year
Defective Year
Excessive Year
2
1
Seventh
Tishri
30 days
30
30
3
2
Eighth
Heshvan
29 days
29
30
4
3
Ninth
Kislev
30 days
29
30
5
4
Tenth
Tevet
29 days
29
29
6
5
Eleventh
Shevat
30 days
30
30
7
6
Twelfth
Adar
29 days
29
29
8
7
First
Nisan
30 days
30
30
9
8
Second
Iyyar
29 days
29
29
10
9
Third
Sivan
30 days
30
30
11
10
Fourth
Tammuz
29 days
29
29
12
11
Fifth
Av
30 days
30
30

Questions and formulas:
Question: How many month names are there for the tenth numbered month?
Formula: ROWS(UNIQUE(FILTER(C1, B1="Tenth")))
Formula2: ROWS(UNIQUE(FILTER(C2:C12, B2:B12="Tenth")))
Level: medium
Question: What is the defective year for the eighth numbered month?
Formula: SUMIFS(E1,B1,"Eighth")
Formula2: SUMIFS(E2:E12,B2:B12,"Eighth")
Level: easy
Question: What is the month sequence for the month name of av?
Formula: SUMIFS(A1,C1,"Av")
Formula2: SUMIFS(A2:A12,C2:C12,"Av")
Level: easy
Question: What is the defective year for the regular year of 29 days and month sequence of 2?
Formula: SUM(FILTER(E1, (D1="29 days")*(A1=2)))
Formula2: SUM(FILTER(E2:E12, (D2:D12="29 days")*(A2:A12=2)))
Level: easy