30.
The 3 is representing 3 * 101 which is equal to 30.
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In the number 31, the digit 3 holds a place value of 3 tens, which is equivalent to 30. The value of the digit 3 in this number is 30.
Exactly 31, strangely enough!
You can invent infinitely many expressions that have a value of 31, for example: 31 31 + 0 31 + 0 + 0 30 + 1 30 + 1 + 1 1 x 31 5 x 6 + 1 etc.
3 and 31 because 9+3=12 which is 3 because it goes into 12 evenly and 31 because 93 divided by 31 is 3 or 3 times 31 is 93
1 x 31, 2 x 31/2 , 3 x 31/3 etc. 31 is a prime number.
1/3 + 1/31/3 + 1/31/3 + 1/31/3 + 1/3