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Find the four digit number i...

Find the four digit number in which the first digit is one fourth of the last digit, the second digit is 6 times the first digit, and the third digit is the second digit plus 3.

Correct answers: 107

The first user who solved this task is Snezana Milanovic.

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My wife isn’t very good in th...

My wife isn’t very good in the kitchen. Last time she cooked she burned the salad.

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Sir John Leslie

Died 3 Nov 1832 at age 66 (born 10 Apr 1766). Scottish physicist and mathematician who first created artificial ice. His practical scientific investigations led to his book Experimental Inquiry Into the Nature and Propagation of Heat (1804), dealing with the fundamental laws of heat radiation. Leslie gave the first correct description of capillary action (1802) and invented many instruments, most notably an accurate differential air thermometer, and also a hygrometer, a photometer, the pyroscope, atmometer and aethrioscope. In 1810, he devised a method of obtaining very low temperatures, by evaporating water in a receiver evacuated with an air-pump but containing a drying agent. His mathematical works include texts on geometry, trigonometry and The Philosophy of Arithmetic.

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