Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| American name | British name | Value | Dotted Value | Double Dotted Value | Triple Dotted Value |
| --- | --- | --- | --- | --- | --- |
| octuple whole note | maxima | 32 | 48 | 56 | 60 |
| quadruple whole note | longa | 16 | 24 | 28 | 30 |
| double whole note | breve | 8 | 12 | 14 | 15 |
| whole note | semibreve | 4 | 6 | 7 | 15/2 or 7 1/2 |
| half note | minim | 2 | 3 | 7/2 or 3 1/2 | 15/4 or 3 3/4 |
| quarter note | crotchet | 1 | 3/2 or 1 1/2 | 7/4 or 1 3/4 | 15/8 or 1 7/8 |
| eighth note | quaver | 1/2 | 3/4 | 7/8 | 15/16 |
| sixteenth note | semiquaver | 1/4 | 3/8 | 7/16 | 15/32 |
| thirty-second note | demisemiquaver | 1/8 | 3/16 | 7/32 | 15/64 |
| sixty-fourth note | hemidemisemiquaver | 1/16 | 3/32 | 7/64 | 15/128 |
| hundred twenty-eighth note | quasihemidemisemiquaver semihemidemisemiquaver | 1/32 | 3/64 | 7/128 | 15/256 |
| two hundred fifty-sixth note | demisemihemidemisemiquaver | 1/64 | 3/128 | 7/256 | 15/512 |
Question:
what is the double dotted value when the triple dotted value is 15/128?
Answer:
7/64