Răspuns:
a = 1200 ; b = 240 ; c = 200 ; d = 381
Explicație pas cu pas:
a+b+c+d = 2021
a = 5b
c = b-40
d = b+141
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5b+b+b-40+b+141 = 2021 =>
8b + 101 = 2021 =>
8b = 2021-101 =>
8b = 1920 =>
b = 1920:8 => b = 240
a = 5·240 => a = 1200
c = 240-40 => c = 200
d = 240+141 => d = 381
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1200+240+200+381 = 2021 , corect