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How many children are there in their family?

In a big family, Annabelle and Christopher are twins. Annabelle: ''I have 4 brothers.'' Christopher: ''I have as many brothers as sisters.'' So, how many children are there in their family?

Correct answers: 218

The first user who solved this task is Allen Douglas.

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Corporate Story

At a meeting, the Boss told a joke.
Everyone on the team laughed except one guy.
The Boss asked him, 'Didn’t you understand my joke?'
The guy replied, 'Oh I understood it, but I resigned this morning.'

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Adrien-Marie Legendre

Born 18 Sep 1752; died 9 Jan 1833 at age 80. French mathematician who contributed to number theory, celestial mechanics and elliptic functions. In 1794, he was put in charge of the French government's department that was standardizing French weights and measures. In 1813, he took over as head of the Bureau des Longitudes upon the death of Lagrange, its former chief. It was in a paper on celestial mechanics concerning the motion of planets (1784) that he first introduced the Legendre Polynomials. His provided outstanding work on elliptic functions (1786), and his classic treatise on the theory of numbers (1798) and also worked on the method of least squares.«[DSB gives date of death 9 Jan 1833. EB gives 10 Jan 1833.]

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