10 cm 5 cm x cm 20 cm X Besarnya nilai x pada gambar di ata adalah ... cm. c. 30 b. 25 d. 32 a. 20
[tex] \begin{aligned}\frac{10}{10 + 20} = \frac{5}{5 + x} \\ \\ \frac{10}{30} = \frac{5}{5 + x} \\ \\ 10(5 + x) = 5 \times 30 \\ \\ 50 + 10x = 150 \\ \\ 10x = 150 - 50 \\ \\ 10x = 100 \\ \\ x = \frac{100}{10} \\ \\ x = 10 \: cm\end{aligned}[/tex]
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