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Linear interpolation

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The value of an avar controlling the y-coordinate of a ball is 400 in frame 14, and 220 in frame 20. The y-coordinate of the ball between those frames is determined by linear interpolation.
What is the value of the ball's y-coordinate in frame 19?
  • Your answer should be
  • an integer, like 6
  • a simplified proper fraction, like 3/5
  • a simplified improper fraction, like 7/4
  • a mixed number, like 1 3/4
  • an exact decimal, like 0.75
  • a multiple of pi, like 12 pi or 2/3 pi