《晋书·志·第七章》
通数三十一乘以合数，除以会数四十七，所得为退分。
通数乘合数，余如会数而一，退分也。
Multiply the whole number 31 by the meeting number and divide it by the meeting number 47, and the result is the retreat difference.
<s>[INST] Convert the following modern Chinese text into Classical Chinese: 通数三十一乘以合数，除以会数四十七，所得为退分。 [/INST] 通数乘合数，余如会数而一，退分也。</s>
Convert the following modern Chinese text into Classical Chinese: 通数三十一乘以合数，除以会数四十七，所得为退分。
user
通数乘合数，余如会数而一，退分也。
assistant