Explicație:
[tex] \red{ \boxed{\bf \: c = \dfrac{md}{ms} \cdot100 }}[/tex]
md = 300 g
ms = md + m apă ⇒ ms = 300 + 250 ⇒ ms = 550
[tex]\bf \: c = \dfrac{30 \not0}{55 \not0} \cdot100= \dfrac{30^{(5} }{55} \cdot100 = \dfrac{6}{11}\cdot100 [/tex]
[tex]\bf \: c = 0,545454 \cdot100\Rightarrow \pink{ \underline{c = 54,54 \: \%}}[/tex]
