- #1

Johnx1

- 49

- 0

My answer:

Siti = S

Xinyi = X

Gave/threw away stickers = TWe know:

S = X

S = T - 55

X = T -15

X = 3Sso, in short, I did elimination.

S = T - 55

-(3S = T - 15)

so, S = 20

Answer = 60.

My question is, is there a better way to do this besides elimination?