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7p-10p = -3
10p = 180 p = 18
Well, isn't that a happy little riddle! If one of the coins is not a 10p coin, then it must be a 1p coin. So, you have a 10p coin and a 1p coin in your hand, making a total of 11p. Just like painting, sometimes it's the small details that make the big picture come together beautifully.
fraction = 1/2 10p/20p = 1/2
The simplest way is 2*10p