Question

Cit ar costa 1 luna la sala de forta ,daca o zi costa 27 lei .? Am nevoie de ajutor ,va rooog

Answer 1

$1 zi ............. 27 lei\\ 28 sau 31 zile ............... x lei \\ \\ \boxed{\text{ Proportionalitate directa:}} \\ \\ \bullet \quad \text{x} =\dfrac{28\cdot 27}{1} \Rightarrow \text{x} = 756 \\ \\ \bullet \quad \text{x} =\dfrac{31\cdot 27}{1} \Rightarrow \text{x} = 837 \\ \\ Deci, intr-o luna ai da intre 756 - 837 lei.\\Depinde cate zile are luna respectiva.$