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VTMO 2020 — Grade 7 — vtmo Question 7

VTMO · VTMO 2020 — Grade 7 — vtmo

Question 7

Natural numbers $a , b$ satisfy $7 a + 11 b = 2020$. When $11 a + 7 b$ is maximal, find $ab$.
  1. $3975$
  2. $2208$
  3. $278$
  4. $276$
  5. $287$