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Calculate the number 690

NUMBERMANIA: Calculate the number 690 using numbers [7, 8, 4, 5, 10, 100] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 53

The first user who solved this task is Sanja Šabović.

#brainteasers #math #numbermania

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Dad's turn to feed the baby....

The first-time dad was taking a turn at feeding the baby some strained peas. Naturally, there were traces of the food all over the baby.

His wife comes in, looks at the infant, then at her husband, who is just staring off into space and says, "What in the world are you doing?"

He replied, "I'm just waiting for the first coat to dry, so I can put on another."

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Richard Christopher Carrington

Died 27 Nov 1875 at age 49 (born 26 May 1826).English astronomer who, by observing the motionsp of sunspots, discovered the equatorial acceleration of the Sun; i.e., that it rotates faster at the equator than near the poles. He also discovered the movement of sunspot zones toward the Sun's equator as the solar cycle progresses. Carrington devoted himself to the study of sunspots and his work, extending from 1853 to 1861, was collected in Observation of the Spots of the Sun (1863). Carrington also was the first to observe a sun flare (1859). He was observing a prominent group of sunspots on 1 Sep 1859, when suddenly "two patches of intensely bright and white light broke out." which brightened rapidly and decayed. The flare he had seen was of the rare variety that is visible in white light.(Image: detail of a drawing by R.C. Carrington, showing the location of the flare he observed while making a drawing of an active region. Reproduced from his 1860 paper in Monthly Notices of the Royal Astronomical Society)

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