self Maths Puzzle

If the difference between a three digit number ABC and the number formed by reversing its digits is divisible by 7 then how many number of possible values of ABC exist?

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self Other Question

A two digit number added to 18, we get another two digit number with reversed digits. Then how many pairs of two digit numbers are possible? A person covers 800km partly at a speed of 50kmph and partly at a speed of 150kmph, in 10 hours over all. What is the distance covered at the speeds of 150 kmph?