self Maths Puzzle

A number of three digits in base 7, when expressed in base 9, has its digits reversed in the order. What is the sum of the digits of the number?

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self Other Question

A transport agency has 5 carriers, each of capacity 15 tonnes. The carriers are scheduled such that the first carrier makes a trip every day, the second carrier makes a trip every second. The third makes a trip every third day and so on. Find the maximum number of times in a year that it is possible to dispatch a total shipment of 75 tonnes in a single day. The operation starts on the 7th January 2010 and continue till the end of the year (31st December 2010) without any holiday.
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When the index of an exponential expression with a positive base is doubled, then the expression increases by 700%. If one of the values that the base cannot have is X which of the following is not a possible value of P?