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7. If you allow for change, an infinite number of ways; eg 1 x 10p with 1 x 2p change or 1 x 10p with 2 x 1p change, etc.
7p-10p = -3
5p x 2p = 10p, then 10p / 4p = 2 remainder 2
1 out of 20 of 200 pound is 10 pound! For it to be 10p it would have to be 1 out of 2000.
17p = 2p + 5p + 10p