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VTMO 2017 — Grade 2 — semifinal Question 1

VTMO · VTMO 2017 — Grade 2 — semifinal

Question 1

Find $N = \left(15 + 20 + 25 + 30\right) - \left(10 + 15 + 20 + 25\right)$.
  1. $5$
  2. $10$
  3. $15$
  4. $20$
  5. $25$