Posts filed under ‘50 dinars’

Going to Market

A shopkeeper has lent 50 dinars to a sheik, and another 50 to a merchant. The sheik paid the debt in four installments of 20, 15, 10, and 5 dinars:

Installment Paid Still Owed
1 20 30
2 15 15
3 10 5
4 5 0
Total 50 Total 50

 
The merchant paid the debt in four installments of 20, 18, 3, and 9 dinars:

Installment Paid Still Owed
1 20 30
2 18 12
3 3 9
4 9 0
Total 50 Total 51

 
How to explain the difference of 1 dinar?

Mathematical excerpts from The Man Who Counted by Malba Tahan

August 12, 2010 at 3:38 pm Leave a comment


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