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VTMO 2019 — Grade 7 — semifinal Question 3

VTMO · VTMO 2019 — Grade 7 — semifinal

Question 3

Positive integers satisfy $ab = 32 , bc = 56 , ca = 28$. Find $a + b + c$.
  1. $29$
  2. $28$
  3. $20$
  4. $18$
  5. $19$