Question

suma a trei numere naturale este 90 . aflati nr stiind ca sunt direct proportionale cu5, 12, 13

Answer 1

{ a, b, c } d.p { 5,12,13}
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a + b + c = 90
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a / 5 = b / 12 = c / 13 = K

a / 5 = K => a = 5 K
b / 12 =K => b = 12 K
c / 13 = K => c = 13 K

5 K + 12 K + 13 K = 90
17 K + 13 K = 90
30 K = 90
K = 90 : 30
K = 3

a = 3 × 5 = 15
b = 3 × 12 = 36
c = 3 × 13 = 39