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Calculate the number 7180

NUMBERMANIA: Calculate the number 7180 using numbers [3, 8, 6, 6, 13, 875] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 27

The first user who solved this task is Sanja Šabović.

#brainteasers #math #numbermania

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How does a sundial work?

Son: “Hey Dad, how does a sundial work?”

Dad hands son a phone…

“Ok, now just call someone.”

Son: “Why can’t you do it?”

Dad: “Because that would be a DADdial.”

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James Challis

Died 3 Dec 1882 at age 78 (born 12 Dec 1803).English astronomer and clergyman, famous in the history of astronomy for his failure to discover the planet Neptune. Astronomer and mathematician John Couch Adams had studied the known deviations in the orbit of the planet Uranus which indicated a planet even further out. In 1845, Adams gave Astronomer Royal George Airy a calculated orbital path for the unknown planet. But Airy was more interested in the primary job of navigation and timekeeping observations. Airy informed Challis, who did not begin until July 1846, and actually sighted the new planet four times without recognising it. On 23 Sep 1845, the new planet was instead discovered from Berlin Observatory. Challis admitted that Adam's prediction was within 2° of the planet's position.

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