if 120% of is a euqal to 80% of b, then
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120/100 × a = 80/100 × b
120 a = 80 b (100 gets canceled on both sides)
3 a = 2 b (120 & 80 gets canceled by 40)
a/b = 2/3
120 a = 80 b (100 gets canceled on both sides)
3 a = 2 b (120 & 80 gets canceled by 40)
a/b = 2/3
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