Question

3/s=12/5 missing proportions

Answer 1

$\frac{3}{s}=\frac{12}{5} \ \ \ |\hbox{cross multiply} \\ \\ 12s=3 \times 5 \\ \\ 12s=15 \ \ \ |\div 12 \\ \\ s=\frac{15}{12} \\ \\ s=\frac{5 \times 3}{4 \times 3} \\ \\ s=\frac{5}{4}$

Answer 2

$\frac{3}{s}=\frac{12}{5}\ \ \ \ | cross\ multiplication\ and\ s \neq 0\\\\ 3*5=12x\\\\ 15=12x\ \ \ | divide\ by\ 12\\\\ x=\frac{15}{12}=1\frac{3}{12}=1\frac{1}{4}$