If 10% of A = 20% of B, then A:B=..
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10/100 x A = 20/100 x B
A/B= 20/100 x 100/10
A/B= 2/1
.’. A:B= 2:1
A/B= 20/100 x 100/10
A/B= 2/1
.’. A:B= 2:1
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