Answer :
[tex]5\ chock\ ices\ cost\ 330p\\
9\ chock\ ices\ cost\ x\\\\\
Ratio:\\
5-330\\
9-x\\\\Cross\ multiplication\\\\\
5x=330*9\\
5x=2970\ \ \ | divide\ by\ 5\\
x=594\\\\
9\ will\ cost\ 594p.[/tex]
use unitary method
for 5 it costs 330p
so for 1 choc it will cost 330/5
to get 9,
(330/5) =66
66 multiplied by 9 =594
therefore 9 will cost 594p