Question 467911: What is the tens digit of the greatest 4 digit even number which uses each of the digits 5,7,8 and 9 exactly once?
Answer by moshiz08(60)   (Show Source):
You can put this solution on YOUR website! The digits we can use are 5, 7, 8, and 9. The only even digit here is 8, so for this number to be even it must end with 8. We want the number to be as big as possible, so it should start with the biggest digit 9. The second digit should be the biggest one left which is 7. This leaves 5 as the third digit, so the number reads 9758. Note that the 5 is in the tens place.
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