The average of four numbers is 21, of the average of three of them is twice
than the fourth number then find the fourth number.
hildren have 1? chocolates each but among them 9 children have 8
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Step-by-step explanation:gfvjhfhbjhvsnmbcjhjhsjdgfch
gftyfdhkjyfygjhgtfjh
ygtfgjsduyweuk
gewhgfygequgfhgf
ghjegwhfyughfgyu
ygyufgheuiwyiefuigd
hdfgusgjkshd
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