Math

[yellowsky]

At a BBQ the guests brought salads, drinks and desserts.

7 guests brought a salad, a dessert and drinks.
17 guests brought exactly 2 items.
23 guests brought drinks.
21 guests did not bring a salad.
9 guests brought only a dessert.
11 guests did not bring a drink or a dessert.
10 guests brought only a salad and a drink.
11 guests brought a drink and a dessert.
How many guests were at the party?

[Chris-T]

I have not taken this type of Math before. However, I have
a solution (not sure it's the same way you expect for Math class).
To find How amny Guests total, one way to find each of 8 types
of guests (A ---> H) as shown on picture attached. Hope you can
figure out the logics (please check).

BTW - Which "Math" class is this? seems interesting. :morelove:

[ffffff]

52 guests

bring:

salads only = 11
dessert only = 9
drinks only = 2
salads and dessert only = 3
dessert and drinks only = 4
salads and drinks only = 10
salads, dessert and drinks = 7
nothing = 6

[yeudoi]

Yep 52 Guests

[Chris-T]

Thanks for re-checking my work, both fffff & yeudoi.
Seems like we have different # for H (5 Vs. 11).
I thought that "11 guests did not bring a drink or a dessert" include
those did not bring salad either (ie include "G=Nothing=6).
Thanks

[yellowsky]

thks a lot.
This is Calculus

[Chris-T]

yellowsky - thanks for reply - Good Luck! I heard it's pretty difficult.

[Huyenthoai99]

Yellow Sky!!! HT thấy Calculus đâu có học dạng này... HT nghĩ nó giống như là Statistics thì.... Right???

[Tammy Nguyen]

co' pha?i ca'i na`y di'nh da'ng to'i Union and Intersection kho^ng ?

[giatugiatu]

Ở Việt Nam gọi là Tân Toán Học ( Trước 1975 )

Không biết tiếng Anh gọi là gì ???

gtgt

[Trung Quốc]

Logic

[yellowsky]

m`inh cung khong biet cai loai toan nay goi la gi nua~, Nhung m`inh lay Calculus. Cam on may Ba.n nhieu!

[giatugiatu]

Đúng rồi !

Logic and/or Symbolic Logic

[yeudoi]

It's relate to probability.

Sets and subset... Union...