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11.


Let H be the number of comic books Harry started with.

He swapped 5 of his for 7 of Jenny's, so:

  • He gave 5 to Jenny, meaning he now has: H - 5
  • Received 7 from Jenny, meaning he now has: (H - 5) + 7 = H - 5 + 7 = H + 2

He bought 8 from the shop, so:

  • He has 8 more, meaning he now has: (H + 2) + 8 = H + 2 + 8 = H + 10

He gave 9 to Tom, so:

  • He has 9 fewer, meaning he now has: H + 10 - 9 = H + 1

He how has 12, so:

H + 1 = 12

→ H = 11


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