One-fifth of the monthly pocket money contributes Maros for food for his cat, half of the rest postpone for a new smartphone. The remaining € 8 spend. How much pocket money gets Maros a month?

Correct result:

x =  20 Eur


1/5x + 1/2(1-1/5)x + 8 = x

1/5•x + 1/2•(1-1/5)•x + 8 = x

4x = 80

x = 20

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