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For those that wants to know how the questions works

• Q2

  

  + counting

  Ans: 38_{Credit to: Classmate}

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• Q6

  _{Credit to: Louise}

  

  Ans: 5

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• Q10

  _{Credit to: Louise}

  Ans: 4

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• Q15

  _{Credit to: Shirly}

  （亦可以理解為）左右加埋然後減上下加埋等於中間

  Ans: 2

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• Q16

  _{Credit to: Shirly}

  Difference between sum of even no. and sum of odd no.

  Ans: 5

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• Q20

  _{Credit to: Leo}

  Ans: 2:53

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• Q30

  _{Credit to: Louise}

  Ans: R