Logic Puzzle

77. What number should replace the question mark?
  What is the next number?
Answer
Ans = 86.
The amount deducted increases by 0.5 each time. i.e. 0.5, 1, 1.5, 2, 2.5,3,3.5.
78. What number should replace the question mark?
  What is the next number?
Answer
Ans = 2.
In rows and columns alternate digits total the same, for example 5 +9 = 10 + 4.
123456789101112131415


161718192021222324252627282930


31323334353637383940

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