book Maths Puzzle Numerical Ability

my "apollo 13" DVD falls out of its case and rolls down the hill. If the DVD is 5inches wide and rolls a distance of .0035, how many times does it roll?

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book Other Question

How do I convert 9/16 to a percent? How can you prove that:

odd + odd = even
even + even = even (you initially put even + even = odd)
odd + even = odd

????