A website Maths Puzzle Category

Solve Q25 and Q26 based on the following information :
Q. Sherlock Homes and Dr. Watson have to travel from Rajeev Gandhi chowk to Indira Gandhi International Airport via the metro. They have enough coins of 1, 5, 10 and 25 paise. Sherlock Homes agree to pay for Dr. Watson only if he tells all the possible combinations of coins that can be used to pay for the ticket.
How many combinations are possible if the fare is 50 paise ?
A. 52
B. 49
C. 45
D. 44

Q. How many combinations are possible if they get an international dignity discount of 10%, i.e. the fare is 45 paise ?
A. 45
B. 44
C. 39
D. 36

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A website Other Question
In Chess , a knight moves two squares in one direction and one square in another direction , ending up on the diagonally opposite corner of a 2*3 grid. Intervening squares can be occupied.Find the maximum number of the knights which can be placed on an 8*8 chess board so that no knight threatens another knight(can move into a square occupied by one of the another knights).
A. 34
B. 32
C. 30
D. None of these
If x = -0.5, then which of the following has the smallest value?
A. 2^1/x
B. 1/x
C. 1/x^2
D. 2^x
E. 1/√-x