Margaret and Zdena weigh the same and Petra 3 kg more. Together weigh 156 kg. How much do they weigh?

Correct answer:

M =  51 kg
Z =  51 kg
P =  54 kg

Step-by-step explanation:

P = 3+M
M+Z+P = 156

M-Z = 0
M-P = -3
M+P+Z = 156

M = 51
P = 54
Z = 51

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