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VTMO 2017 — Grade 9 — semifinal Question 4

VTMO · VTMO 2017 — Grade 9 — semifinal

Question 4

Positive integers $a \lt b \lt 1000$ satisfy $9 a \gt 7 b$. Find the maximum $b - a$.
  1. $210$
  2. $209$
  3. $231$
  4. $198$
  5. $221$