"As I was going to St Ives" (Roud 19772) is a traditional English-language nursery rhyme in the form of a riddle.
The most common modern version is:
The following version is found in a manuscript (Harley MS 7316) dating from approximately 1730: [1]
A version very similar to that accepted today was published in the Weekly Magazine of August 4, 1779: [2]
The earliest known published versions omit the words "a man with" immediately preceding the seven (or nine) wives, but he is present in the rhyme by 1837. [3]
There were a number of places called St Ives in England when the rhyme was first published. It is generally thought that the rhyme refers to St Ives, Cornwall, when it was a busy fishing port and had many cats to stop the rats and mice destroying the fishing gear, although some people argue it was St Ives, Cambridgeshire, as this is an ancient market town and therefore an equally plausible destination. [4] [5]
The traditional understanding of this rhyme is that only one is going to St Ives—the narrator. All of the others are coming from St Ives. The trick is that the listener assumes that all of the others must be totaled up, forgetting that only the narrator is said to be going to St Ives. [1] [6] If everyone mentioned in the riddle were bound for St Ives, then the number would be 2,802: the narrator, the man and his seven wives, 49 sacks, 343 cats, and 2,401 kits.
This interpretation provided the basis for a verse reply from "Philo-Rhithmus" of Edinburgh, in the September 8, 1779, issue of the Weekly Magazine: [7]
Owing to various ambiguities in the language of the riddle, several other solutions are possible. While it is generally assumed that the narrator met the man and his wives coming from St Ives, the word "met" does not necessarily exclude the possibility that they fell in while traveling in the same direction. [8] In this case, there is no trick; just an arithmetical calculation of the number of kits, cats, sacks, and wives, along with the man and the narrator. Another possible answer is that the man with seven wives might have seven wives, but that none of them was accompanying him on the journey. One way of stating the answer, taking account of these ambiguities, is "at least one, the narrator plus anyone who happens to be travelling in the same direction". [9] Still other interpretations concern the phrasing of the question, which might be understood to exclude the narrator. If only the narrator were travelling to St Ives, but the phrase, "kits, cats, sacks, and wives" excludes him, then the answer to the riddle is zero. If everyone—including those being carried—were travelling to St Ives, but only the kits, cats, sacks, and wives are counted, then the answer is precisely 2,800.
A similar problem is found in the Rhind Mathematical Papyrus (Problem 79), dated to around 1650 BC. The papyrus is translated as follows: [10]
| houses | 7 | |||
| 1 | 2,801 | cats | 49 | |
| 2 | 5,602 | mice | 343 | |
| 4 | 11,204 | spelt | 2,301 [ sic ] | |
| hekat | 16,807 | |||
| Total | 19,607 | Total | 19,607 |
The problem appears to be an illustration of an algorithm for multiplying numbers. The sequence 7, 72, 73, 74, 75 appears in the right-hand column, and the terms 2,801, 2×2,801, 4×2,801 appear in the left; the sum on the left is 7×2,801 = 19,607, the same as the sum of the terms on the right. The equality of the two geometric sequences can be stated as the equation (20 + 21 + 22)(70 + 71 + 72 + 73 + 74) = 71 + 72 + 73 + 74 + 75, which relies on the coincidence 20 + 21 + 22 = 7.
Note that the author of the papyrus listed a wrong value for the fourth power of 7; it should be 2,401, not 2,301. However, the sum of the powers (19,607) is correct.
The problem has been paraphrased by modern commentators as a story problem involving houses, cats, mice, and grain, [11] although in the Rhind Mathematical Papyrus there is no discussion beyond the bare outline stated above. The hekat was 1⁄30 of a cubic cubit (approximately 4.8 L or 1.1 imp gal or 1.3 US gal).
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St Ives is a medieval market town and civil parish in the Huntingdonshire district in Cambridgeshire, England, 5 miles (8 km) east of Huntingdon and 12 miles (19 km) north-west of Cambridge. St Ives is historically in the county of Huntingdonshire.
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