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VTMO 2017 — Grade 3 — semifinal Question 1

VTMO · VTMO 2017 — Grade 3 — semifinal

Question 1

Find $N=(15+20+25+30+35+40)-(10+15+20+25+30+35)$.
  1. $10$
  2. $20$
  3. $30$
  4. $35$
  5. $40$