general Maths Puzzle

A three digit number consists of 9,x and y . When these digits are reversed and then subtracted from the original number the answer yielded will be consisting of the same digits arranged yet in a different order. What is the digits which x and y carry?

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general Other Question

I m chasing a thief. The thief has a head start of 13 miles over me.i have a speed 1.5mile/hr greater than the thief. my dog has a speed of 13km/hr. My dog runs to and from between me and the thief. How many miles does my dog run, before i catch the thief? Product of two numbers is 900. the sum of two numbers is 30 greater than the difference of two numbers. What are those numbers?