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0 / 60 seg.
All the girls of Mary's class are standing in a row. Mary is the 11th girl from both ends. How many girls are studying in Mary's class?
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Clue
21 GIRLS. 1 2 3 4 5 6 7 8 9 10 11 10 9 8 7 6 5 4 3 2 1
THE PROBABILITY IS 0.5. THE POSSIBILITIES ARE (GIRL, GIRL) AND (GIRL, BOY). SO THE PROBABILITY THAT BOTH CHILDREN ARE GIRLS IS 1/2 OR 0.5
FOUR BROTHERS AND THREE SISTERS. EVERY BOY WILL HAVE 3 BROTHERS AND 3 SISTERS. EVERY GIRL WILL HAVE 4 BROTHERS AND 2 (HALF OF THE NUMBER OF BROTHERS) SISTERS
SHE HAS 8 CHILDREN. THE SISTERS HAVE JUST ONE BROTHER
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