A 3-digit instrument measures to 3 significant digits; A 4-digit instrument measures to 4 significant digits. A 3.5 digit instrument is somewhere in between. Since 0.5 is the log base 10 of 3, the display would be accurate within 3 units in the 4th digit.
At least that's what I tried to explain to a bright student in my grade 11 class. She told her engineer dad and he said it was nonsense.
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the first 35 digits of pi is... 3.14159265358979323846264338327950288
i think there are 18 digit 5s.
The factors of 35 are 1, 5, 7, 35. All of them are odd. 7 and 35 are multiples of 7. 5 has a digit sum equal to 5. No number satisfies all of the conditions.
100
It is 315.