Hari thinks a+k = 70, b+k = 78, c+k = 88, d+k = 90 Hari thinks that Mohan is con

Question

Hari thinks a+k = 70, b+k = 78, c+k = 88, d+k = 90
Hari thinks that Mohan is confident(correctly knows) on the value of b(Not k).
Hari thinks that Mohan thinks a+k = 40, b+k = 90, c+k = 38, d+k = 60
Hari thinks that Lalit thinks that Mohan is confident(correctly knows) on the value of c(not k).
Hari thinks that Lalit thinks that Mohan thinks a+k = 60, b+k = 80, c+k = 92, d+k = 49.
Hari thinks that Lalit thinks a+k = 39, b+k = 78, c+k = 69, d+k = 87.
Hari asks Lalit the value of k. Lalit asks Mohan. Lalit says 40. What does hari conclude?

Explanation / Answer

Hari thinks let Mohan told to Lalit k = z. Hence Lalit thinks c = 92-z. Hence Lalit concluded that k = 69-92+z = z - 23 = 40 => z = 63. Hence Mohan told to Lalit 63. Hari thinks b = 90-63 = 27. Hence k = 78-27 = 51.

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