$8$ litres of petrol costs $₹624$. If the cost of $12$ litres of petrol is $₹k$, then the value of $k$ is .

Find the value of $x$: 

$\frac{56}{63}=\frac{16}{x}$, then $x=$ _____

Insert: $<, > \mathrm{or} =$

$\frac{5}{6}$_____$\frac{8}{9}$

Insert: $<, > \mathrm{or} =$

$\frac{57}{133}$_____$\frac{39}{91}$

Insert: $<, > \mathrm{or} =$

$28:40$_____$70:100$

Insert: $<, > \mathrm{or} =$

$3:50$_____$1:25$