10 because if you count up in two's it goes-
2 4 6 8 10 12 14 16 18 20
So 10 times
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20p, 2p, 2p, 2p, 1p.
20p,50p,5p,2p
1p , 50p , 2p , 10p , 20p .5p
There are 67 ways.
how many ways to make 25p using 1p 2p 5p 10p 20 coins