9999
Add the two greatest possible four digit numbers. 9999 + 9999
three eighths, two thirds, four fifths.
It is possible to recover up to four parts.
Yes.
9409.
Of those, 4/5 is the greatest.
Three are used for calculating the position - the fourth is for error correction.
The greatest number of intersection points with just four lines is 6.
Four of them.
Yes: four cubic numbers are possible.
Fifty three hundredths is one of an infinite number of possible answers.