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Trần Triệu Tân

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last 3 solved tasks
If b9bb7 - b9cbc = ca6 find number abc. Multiple solutions may exist.
In the following circles, the four outer numbers are used to calculate the number in the middle. Can you figure out the rule to determine what number should replace the question mark in the third circle?
How Many Squares Are There?

Charles Babbage

Died 18 Oct 1871 at age 79 (born 26 Dec 1791). English mathematician who was a pioneer of mechanical computation, which he pursued to eliminate inaccuracies in mathematical tables. By 1822, he had a small calculating machine able to compute squares. He produced prototypes of portions of a larger Difference Engine. (Georg and Edvard Schuetz later constructed the first working devices to the same design which were successful in limited applications.) In 1833 he began his programmable Analytical Machine, a forerunner of modern computers. His other inventions include the cowcatcher, dynamometer, standard railroad gauge, uniform postal rates, occulting lights for lighthouses, Greenwich time signals, heliograph opthalmoscope. He also had an interest in cyphers and lock-picking.«[EB gives birth date 26 Dec 1791.DSB gives birth date as 26 Dec 1792.]

A young lady came home from a ...

A young lady came home from a date, rather sad. She told her mother, "Jeff proposed to me an hour ago."

"Then why are you so sad?" her mother asked.

"Because he also told me he was an atheist. Mom, he doesn't even believe there's a hell."

Her mother replied, "Marry him anyway. Between the two of us, we'll show him how wrong he is."
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