A bag contains [tex]\(1p\)[/tex], [tex]\(2p\)[/tex], and [tex]\(5p\)[/tex] coins.
[tex]\(\frac{3}{8}\)[/tex] of the coins in the bag are [tex]\(1p\)[/tex] coins.
There are as many [tex]\(5p\)[/tex] coins as [tex]\(1p\)[/tex] coins in the bag.
There are 640 coins in total.
Work out the number of [tex]\(2p\)[/tex] coins in the bag.