Question

Va rog din suflet e urgent ajutor!


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Answer 1

Răspuns:

b) 50

Explicație pas cu pas:

$\dfrac{x + y}{3} = \dfrac{y + z}{5} = \dfrac{z + x}{4} = \dfrac{2(x + y + z)}{3 + 5 + 4} = \dfrac{2 \cdot 150}{12} = \dfrac{300}{12} = 25$

$\dfrac{x + y}{3} = 25 \iff x + y = 75$

$\dfrac{y + z}{5} = 25 \iff y + z = 125$

$\dfrac{z + x}{4} = 25 \iff z + x = 100$

din:

$(x + y) + (y + z) = 75 + 125$

$y + (x + y + z) = 200$

$y + 150 = 200 \implies y = 50$