If i understand what you're asking then,
0.5*0.6 = 0.3
so you need to find any other thing that would also = 0.3
examples could be:
3/10 = 0.3
0.1+0.2 = 0.3
0.6-0.3 = 0.3
1.0-0.7 = 0.3
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