Jam cakes

Mom baked a third of plum jam cakes, one third cheesecakes and 18 poppy. How many cakes she had bake?

Correct result:

x =  54

Solution:

$$\begin{gathered} 18=(1-1\mathrm{/}3-1\mathrm{/}3)x \\ 18=3x \\ x=54 \end{gathered}$$

1/3 x = 18

1/3•x = 18

x = 54

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