David number

Jane and David train the addition of the decimal numbers so that each of them will write a single number, and these two numbers then add up. The last example was 11.11. David's number also had the same number of digits before and after a point. Jane's number has the same property. David's number has different digits. Jane's number had exactly two digits the same. Find the largest possible number David could write.

Correct answer:

D =  0.9

Step-by-step explanation:

D=0.9



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