Răspuns:
Explicație pas cu pas:
a/3 = b/5 => a = 3 b/5
100 a - 6 b = 100 × 3 b/5 - 6 b = 60 b - 6 b = 54 b
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Sau:
a/3 = b/5 = k -> coeficient de proportionalitate
a = 3 k si b = 5 k
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100 a - 6 b = 100 × 3 k - 6 × 5 k = 300 k - 30 k = 270 k
