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VTMO 2014 — Grade 5 — semifinal Question 11

VTMO · VTMO 2014 — Grade 5 — semifinal

Question 11

Four balls are red, yellow, blue and black. Red is heavier than yellow but lighter than blue; black is lighter than red but heavier than yellow. Put them in decreasing weight order.
  1. Blue–red–yellow–black
  2. Yellow–black–red–blue
  3. Black–yellow–red–blue
  4. Blue–red–black–yellow
  5. Yellow–red–black–blue