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4 digit number derived from a single digit (Posted on 2018-02-26) Difficulty: 3 of 5
A number consisting of 2 identical digits, say xx
is multiplied by 99.

Write down the product P, given its tens digit (i.e. 3rd from the left) is y.

P&P only.

No Solution Yet Submitted by Ady TZIDON    
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re: Solution (spoiler) | Comment 2 of 3 |
(In reply to Solution (spoiler) by armando)

Building on Armando's solution

P= (9-y,8-y,y,y+1)

We get P = 
    1000*(9-y) + 100*(8-y) + 10y + y+1
= 9801 - 1089y

  Posted by Steve Herman on 2018-02-26 11:12:50
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