12 & 15
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There are infinitely many possible answers. Three examples: 1*180, 10*18, 100*1.8
One example is 90 x 2 = 180
Work out the difference between 180 and 171 (9) and divide that by 180. Multiply that by 100 to get the percentage difference (5%)
60 and 3
They are: 4*9*5 = 180