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VTMO 2017 — Grade 6 — semifinal Question 8

VTMO · VTMO 2017 — Grade 6 — semifinal

Question 8

The teacher writes $6 , 80 , N$ with $N$ even. Tom reads $6$ as $9$, but obtains the same lcm. Find the least $N$.
  1. $18$
  2. $24$
  3. $36$
  4. $90$
  5. Other