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Answer: original no. = 60
Step-by-step explanation:
let the original no. be 'x',
so, 2/3 x = x - 20
2/3 x - x = -20
2/3 x - 3/3 x = -20
-1/3 x = -20
-x = -20 X 3
-x = -60
x = 60