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Convergence articles

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A boy gives 11 coins of equal denomination to a man, and the man finds that their total value in yen is 4 less than his age.
A water tub holds 73 gallons; the pipe which fills it usually admits 7 gallons in 5 minutes; and the tap discharges 20 gallons in 17 minutes.
The work of the great Renaissance artist/scientist Leonardo da Vinci can be taught in secondary schools through an integrated approach of several disciplines. This article explores the approach of the Ross School.
Images from a 16th century text about the astrolabe and its uses

An introduction to the prime numbers in many of their aspects.

You have two sums of money, the difference of which is 2 dirhams; you divide the smaller sum by the larger and the quotient is equal to 1/2. What are the two sums of money?
A new sourcebook containing the works in their original form along with a translation and a brief commentary.
Two men have a certain amount of money. The first says to the second, "If you give me 5 denari, I will have 7 times what you have left."
What proportions of sugar at 8 cents, 10 cents and 14 cents per pound, will compose a mixture worth 12 cents per pound?
Given two circle tangent at the point P with parallel diameters AB, CD, prove that APD and BPC are straight lines.

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