SOLUTION: A 2-digit number becomes four-sevenths of itself when the position of its digits are interchanged. The difference between both digits is 3. What is the number ?

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Question 896514: A 2-digit number becomes four-sevenths of itself when the position of its digits are interchanged. The difference between both digits is 3. What is the number ?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
4/7(10a+b)=10b+a,
a-b=3
The number is 63