$a)2\cdot 8=s\cdot 12$  

$16=s\cdot 12\mid :12$  

$\frac{16}{12}=s$  

$s=\frac{16}{12}=\frac{4}{3}=1\frac{1}{3}$  

 

$2\cdot 8=9\cdot t$  

$16=9t\mid :9$  

$\frac{16}{9}=t$  

$t=1\frac{7}{9}$  

 

$2\cdot 8=u\cdot 32$  

$16=32u\mid :u$  

$\frac{16}{32}=u$  

$u=\frac{1}{2}$  

 

$2\cdot 8=40\cdot w$  

$16=40w\mid :40$   

$w=\frac{16}{40}=\frac{4}{10}=\frac{2}{5}$  

 

$x$	$2$	$1\frac{1}{3}$	$9$	$\frac{1}{2}$	$40$
$y$	$8$	$12$	$1\frac{7}{9}$	$32$	$\frac{2}{5}$