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HKIMO 2026 Grade 5 National Preliminary Set 03 Question 11

HKIMO · HKIMO 2026 Grade 5 National Preliminary Set 03

Question 11

Define $a\oplus b=a\times5-b-7$. Find $8\oplus(6\oplus11)$.
  1. 21
  2. 25
  3. 15
  4. 117