Skip to content / Đến nội dung
ThichHocToan.com

MathNet 2018-part-03 — 181 problems (EN–VI) Question 70

Math Olympiad Vault · MathNet 2018-part-03 — 181 problems (EN–VI)

Question 70

Annalisa, Bruna and Cecilia are playing football: one of them stands in goal and the others on the field. Whoever scores a goal stays on the field, while whoever has not scored swaps with the goalkeeper. Knowing that Annalisa was on the field for 12 turns and Bruna for 21 turns, while Cecilia was in goal 8 times, who started in goal?

(A) Annalisa
(B) Bruna
(C) Cecilia
(D) Annalisa or Bruna (but certainly not Cecilia)
(E) It can be any of the three friends.