Question 827276
m = amount roses in dozens
n = amount of tulips, dozens
p = amount of carnations, dozens
{{{m=n+2}}} ------ roses amount is two more than tulips amount


Account for the cost:
{{{12m+14n+8p=304}}}


Account for the amount of flowers, as dozens:
{{{m+n+p=27}}}


You have three equations, linear, in three unknowns.  You should begin with using the m=n+2 equation to substitute for m in the two Accounting equations and simplify these.  You will then have a system of TWO equations in TWO unknowns, which will be simpler and easier to solve.  


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