Cake fractions

Thomas ate 1/3 of cake, Bohouš of the rest of the cake ate 2/5.
What fraction of cake left over for others?

Result

x = 2/5 Wrong answer

Step-by-step explanation:

x=1−1/3−2/5⋅(1−1/3)=2/3−2/5⋅2/3=2/5

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