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:

$18 = (1-1/3-1/3) x \ \\ 18 = 3x \ \\ x = 54$

1/3 x = 18

1/3•x = 18

x = 54

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