10 most difficult cur­ren­cies riddles

The rupee is the common name for the currencies of India, Pakistan, Indonesia, Maldives, Mauritius, Nepal, Seychelles and Sri Lanka.

The ariary is the currency of Madagascar. It is subdivided into 5 iraimbilanja and is one of only two non-decimal currencies currently circulating (the other is the Mauritanian ouguiya). Iraimbilanja means literally "one iron weight" and was the name of an old coin worth ​1⁄5 of an ariary.

Just like Panama and El Salvador, the official currency of Ecuador is the U.S. Dollar. The switch from Sucre to USD in 2000 helped the country to achieve economic stability. Ecuador also issues centavo coins (but no banknotes), identical in size and value to their U.S. cent counterparts.

When the British first got involved in Egypt in the nineteenth century, Egypt was using a monetary unit known as the piastre, or Qirsh. Since 100 piastres was roughly between the value of one pound sterling and one Guinea, a new unit, called the pound in English and the ginaih in Arabic, was created equal to one hundred piastres. The Egyptian pound, however, has never been exactly equal in value to the pound sterling.

Directly after the end of WWII, Hungary went through the most severe known incident of inflation ever recorded, peaking at 1.3 × 10^16 percent per month (prices doubled every 15 hours). When the pengő was replaced in August 1946 by the forint, four hundred octillion pengő became 1 forint.

This banknote is not in general circulation. The president on it is Woodrow Wilson, the 28th President of the United States, who held office from 1913 until 1921.

In rupees, we will pay, among others in Pakistan, India, Nepal, but also in Indonesia, Sri Lanka, Maldives, Seychelles and Mauritius. In Bangladesh, however, the official currency is that.

The word "ruble" comes from the verb meaning "break" and refers to the Middle Ages, when pieces of silver were broken into smaller ones when changing money. The ruble was the world's first decimal currency: it was decimalised in 1704 when the ruble became legally equal to 100 kopeks.

The obverse of the $10 bill features the portrait of Alexander Hamilton, who served as the first U.S. Secretary of the Treasury.

Monaco, San Marino and the Vatican City have concluded formal agreements with the EU to use the euro as their official currency and mint their own coins. Kosovo and Montenegro officially adopted the euro as their sole currency without an agreement and, therefore, have no issuing rights.