Let x be the total number of muffins Ms Teo made.


Of them,  the number of the chocolate muffins is  ;

          the number of the blueberry muffins is  .


After selling 84 blueberry muffins and   of the chocolate muffins,    of the muffin left


     -  +  = .


Solve the equation and find x.


Then   is your answer.

Let original number of muffins be M

Then , or  of muffins were chocolate, and so,  were blueberry

Selling  of chocolate means that  of chocolate muffins were sold

After selling 84 blueberry and  chocolate, she had  left, so  of muffins were sold

We then get: 

840 + 5M = 6M ------- Multiplying by LCD, 10

840 = 6M - 5M

M, or original number of muffins = 840



As  of muffins were sold, then  of the muffins were sold 

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