Question

Determinati numerele naturale a b si c stuund ca sunt direct proportionale cu numerele 2 5 si 8 si ca 2a plus15 b egal 158

Answer 1

{ a, b, c } d.p {2, 5, 8 }
2a +  15b = 158

a / 2 = b / 5 = c / 8 = K
a / 2 = K => a = 2 K
b / 5 = K => b = 5 K
c / 8 = K => c = 8 K
2 x 2 K + 15 x 5 K = 158
4 K + 75 K = 158
79 K = 158
K = 158 : 79
K = 2

a = 2 x 2 = 4
b = 2 x 5 = 10
c = 8 x 2 = 16