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VTMO 2022 — Grade 2 — vtmo Question 10

VTMO · VTMO 2022 — Grade 2 — vtmo

Question 10

An, Binh, Chau, Dung have $90$ marbles. An+Binh $= 3 \times$ Chau and An+Binh+Chau $= 2 \times$ Dung. How many does Chau have?
  1. $10$
  2. $15$
  3. $22$
  4. $25$
  5. $30$