AskQ logo

STUCK ON HOMEWORK?

ASK FOR HELP FROM OUR KIASUPARENTS.COM COMMUNITY!

Question

Devi and Siti baked 1200 cookies. Alice and Siti baked 900 cookies. Devi baked 4 times cookies as Alice. how many cookies did Siti sell?

Answer

Let S be the number of cookies Siti baked.
Let D be the number of cookies Devi baked.
Let A be the number of cookies Alice baked.

(1) D + S = 1200

(2) A + S = 900

(3) D = 4A

Substituting (3) into (1):
4A + S = 1200
=> A = (1200 – S)/4 … (4)

Substituting (4) into (2):

(1200 – S)/4 + S = 900
1200 – S + 4S = 3600
3S = 3600 – 1200 = 2400
S = 800

So Siti baked 800 cookies #

(I don’t know how many she sold 🙂 )

0 Replies 2 Likes
0 Replies 1 Like