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ITMC 2018 Grade 4 National Preliminary set01 Question 15

ITMC · ITMC 2018 Grade 4 National Preliminary set01

Question 15

Let $N=9+99+999+9999+99999$. What is the sum of the digits of $N$?
  1. 9
  2. 10
  3. 15
  4. 40
  5. 45