Question 1105262
Jack sold cookies, cakes and muffins in chocolate or butter flavor.
 He sold 140 more cookies than cakes at the fair.
O = A + 140
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1/5 of the cookies and 2/ 3 of the cakes sold were chocolate.
Chocolate = (1/5)O+(2/3)A
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 He sold an equal number of chocolate cakes and cookies.
O = chocA
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He also sold an equal number of butter cakes and muffins.
bA = M
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 The number of cakes sold was 3/4 the number of muffins sold.
A = (3/4)M
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How many more butter flavored than chocolate flavored cookies cakes and muffins were sold. 
Can this be solved with 2 variables.
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It looks like it can't be solved with any number of variables.
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Cheers,
Stan H.
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