Răspuns
Explicație pas cu pas:
a + b = 369 si b + c = 596
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5 × a + 10 × b + 9 × c = 6 249
5 × a + ( 5 × b + 5 × b ) + ( 5 × c + 4 × c ) = 6 249
5 × ( a + b ) + 5 × ( b + c ) + 4 × c = 6 249
5 × 369 + 5 × 596 + 4 × c = 6 249
1 845 + 2 980 + 4 × c = 6 249
4 825 + 4 × c = 6 249
4 × c = 6 249 - 4 825
4 × c = 1 424
c = 1 424 : 4 ⇒ c = 356
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b = 596 - 356 ⇒ b = 240
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a = 369 - 240 ⇒ a = 129
