Others Maths Puzzle

Thirty-one books are arranged from left to right in order of increasing prices. The price of each book differs by Rs2.00 from that of each adjacent book. For the price of the book at the extreme right, a customer can buy the middle book and an adjacent one. Then

a. The cheapest book sells for Rs4.00.
b. The middle book sells for Rs36.00.
c. The most expensive book sells for Rs64.00.
d. The adjacent book referred to is the one to the right of the middle book.
e. None of the statements above is true.

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Others Other Question

Two cars A and B drive straight towards the same point P with speeds a and b respectively. At the start, A, B and P form an equilateral triangle. After some time A and B move to the new positions, B covers 80 miles, and ABP becomes a right triangle. At the moment when A arrives at P, B is 120 miles away from P. What is the distance between A and B in the beginning? A number lock has a four-digit combination made by turning four wheels, each of which has the digits 0 through 9 in order. After 9 comes 0 again. Unfortunately, the lock is partially broken; each time you turn one of the four wheels, one of the adjacent wheels also turns. The correct combination to open the lock is 2000. From which of the following starting numbers is it possible to open the lock? More than one answer may be correct.

0000 1999 2001 3456 6543 7777 8161 8181