If $10 \%$ of $x = 20 \%$ of $y,$ then $x : y$ is equal to

$94$ is divided into two parts in such a way that the fifth part of the first and the eighth part of the second are in the ratio $3:4$. The first part is:

If $A: B = 3: 4$ and $B: C = 8: 9$,then find the value of $A: B: C$.

If $P: Q = 8: 15$,$Q: R = 5: 8$,and $R: S = 4: 5$,then $P: S$ is equal to

Find the triplicate ratio of $7:5$.

If $A: B = 2: 5$,$B: C = 4: 3$,and $C: D = 2: 1$,what is the value of $A: C: D$?