Salut!
[tex]a) \frac{8}{9} = \frac{x}{18} \\ 9x = 8 \times 18 \\ x = 144 \div 9 \\ x = 16[/tex]
[tex]b) \frac{x}{16} = \frac{5}{4} \\ 4x = 6 \times 5 \\ 4 x = 6 \times 5 \\ 4x = 30 \\ x = 30 \div 4 \\ x = 7.5 \\ [/tex]
[tex]c) \frac{10}{3} = \frac{4}{x} \\ 10x = 3 \times 4 \\ 10x = 12 \\ x = 12 \div 10 \\ x = 1.2[/tex]
