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VTMO 2017 — Grade 5 — semifinal Question 1

VTMO · VTMO 2017 — Grade 5 — semifinal

Question 1

Find $N = \left(140 + 135 + 130 + 125 + 120 + 115\right) - \left(110 + 115 + 120 + 125 + 130 + 135\right)$.
  1. $10$
  2. $20$
  3. $30$
  4. $35$
  5. $40$