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amanda148
450/3 = x.
150 = x.
So x = 150.
This means 45 is 30% of 150
The fraction would be 30/100 = 45/x. Cross multiply to get 30x= 4500. Then divide both sides by 30. To get x = 150. 
The equation to help answer similar questions is percent/100 = is/of or part/whole.