Three eighths of the fractional unit is one eighth, and adding a few such fractional units is equal to the smallest prime number. A canal is 7km long and will be finished in 9 days The length of a canal is 7km. It will be completed in 9 days. Every day, we will show how many parts of the canal are

one
Three eighths of a fractional unit is one eighth, and adding a few such fractional units is equal to the smallest prime number
The minimum prime is 2
2-3/8=13/8
13 more
two
1/9

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