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A robot starts at 0 on a number line.
Its move pattern is +10, -3, +10, -3, ... repeating.
What is the FIRST move number after which the robot is standing on or past 50?

Class 6Number Line OperationsWhole Numbers
  • A7th move
  • B9th move
  • C11th move
  • D13th move

Step-by-Step Solution

After each +10/-3 pair the net gain is 7. After 6 pairs (12 moves) it is at 42; the 13th move (+10) takes it to 52, which is the first time it is past 50.
Answer: D) 13th move

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