book Maths Puzzle Numerical Ability

Sherloc holmes states , "if a rod of six feet threw a shadow of nine feet, a tree of 64 feet would throw a shadow of....." what length should Sherlock say next?

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book Other Question

How many different 6-digit numbers can be written using all of the following digits: 2,5,5,6,6,6 ? needing help!!!
a bank account yields 7 percent interest, compounded annually. if you deposit $1,000 in the account, what will the account balance be after 5 years?