jawab kak 1-5 yah kak

[tex]1) \: \frac{8}{x} = \frac{40}{50} \\ x = 10[/tex]
[tex]2) \: \frac{90 \times 100}{90 \times 80} = \frac{x}{4} \\ x = 5[/tex]
[tex]3) \: \frac{60}{75} = \frac{x}{10} \\ x = 8[/tex]
[tex] 4) \: \frac{12}{15} = \frac{x}{ \frac{1}{4} } \\ x = \frac{1}{5} \: jam = 12 \: menit[/tex]
[tex]5) \: \frac{50}{60} = \frac{x}{18} \\ x = 15[/tex]