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Calculate the number 120

Calculate the number 120 using numbers [4, 3, 9, 3, 15, 75] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 69

The first user who solved this task is Sanja Šabović.

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In the Beginning…

In the beginning, God created the heavens and the earth, and then He rested.Then God created man, and then they both rested.Then God created woman, and since then neither God nor man has ever rested.

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Metre

In 1889, the third legal definition of the metre was adopted at the Paris General Conference. An international prototype metre bar was made of a 90-10 platinum-iridium alloy with an X cross section to minimize flexing. The metre was defined as the distance measured between two lines on the bar at the temperature of freezing water, 0°C. The alloy ingot was made possible by a high-temperature furnace devised by Henry Sainte-Claire and his assistant Jules Henry Debray. The alloy was harder than pure platinum, but retained the other desireable properties, including resistance to corrosion. Duplicate prototypes were made and distributed to each of the countries that joined in the international agreement. The same alloy was used to prepare the international protype of the kilogram.«

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