20. Beth intends to solve the following system of equations 5x + 4y = 13 30x + by = 50 The system contains the number b representing the age of Beth (in years). It turns out that Beth can by no means solve the system. How old is Beth? O a) 5 ára O b) 13 ára c) 24 ára d) 30 ára e) 50 ára

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