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.
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40% of one.
20p - 8p = 12p
8p+5 = 11+7p= 8p-7p = 11-5p = 6
8p - 3 = 13 add 3 to both sides 8p = 16 divide by 8 to both sides p = 2
8p+2=4p-10 8p-4p=-2-10 4p=-12 p=-12/4 =-3