The idea is to subtract 10p minus 4p.
The one that is not a 10p is a 20p. The other coin is a 10p. The question/riddle does not say that neither coin is a 10p, only that one of them is not.
1
20% 0f 50p = 10p
31.50 to the nearest tens place is 30
245
10
9
how many ways to make 25p using 1p 2p 5p 10p 20 coins
two £0.05 + £0.05 = £0.10
two hundred and forty-five 245 x £0.10 = £24.50
36 x 10p in £3.60
150 10p coins.
The simplest way is 2*10p
There are 10 ways.
22
5p+5p