I don't know if you meant 24 is 120% of x but if that is what you meant, then the answer would be 20. If you meant 24% is 120% of x then x=.2.
24 is 120% of 20 because 20*1.2=24
24% (AKA .24) is 120% of .2 because .2*1.2=.24 and .24=24%
Hope this helps!
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