Posted by Lizzy on Sunday, January 23, 2011 at 6:38pm.
X = the number of eggs collected at the first coop.
Then, after Coop 1 = X
......after coop 2 = 2X
......after coop 3 2X + 4
......after coop 4 2X + 8
Gave half to grandma leaving X + 4
Gave the remaining 9 to his mother
Making X + 4 = 9 or X = 5.
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