180 is 40 percent of what number?
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This time we have to divide by the percentage: 180/40%=180*100/40=180*10/4=180*5/2=90*5=450.

That means that 40% of 450 should be 180. Let's see: 40/100*450=2/5*450=2*90=180. Yes!

180/450=(40*4.5)/(100*4.5), answer A.
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