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A rectangle drawn from 0,0 to 120,80 enclosing an offset copy 10 units inside has inner dimensions of

  • A.120 by 80
  • B.140 by 100
  • C.100 by 60
  • D.110 by 70

Answer: C

Correct answer: 100 by 60

Offsetting inward takes 10 units off each of the four sides, so 10 comes off both ends of each dimension: \[ 120 - 20 = 100, \qquad 80 - 20 = 60. \] Subtracting the offset only once gives 110 by 70, which is the standard error and is offered here.

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