sumif column C and Column D equal set criteria

[flychic]

I'd like to know if a cell equals a certain criteria, what the total number is of said criteria. For example, if column A is number of flights, column B is the date, column C is the size of wing flown, and column D is the name of the wing - I want to know if the size of wing flown is "21" and the name of the wing is "Goose", how many flights were completed (total). What formula will add up column A if C = "21" and D = "Goose"

	A	B	C	D
1	Flights	Date	Wing Size	Name
2	2	11/7/2017	10,5	Goose
3	7	11/4/2017	10,5	Goose
4	2	11/2/2017	10,5	Goose
5	1	10/30/2017	21	Goose
6	1	10/29/2017	21	Hook
7	6	10/29/2017	10,5	Goose
8	2	10/28/2017	42	Twin
9	3	10/28/2017	21	Hook
10	6	10/28/2017	21	Goose

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[alansidman]

Use this sumifs formula

=SUMIFS(A2:A10,C2:C10,21,D2:D10,"Goose")

 

[flychic]

awesome, thank you so much!