Ageologist had two rocks on a scale that weighed 3.3 kilograms together. rock a was 0.1 of the total weight. how much did rock a weigh?

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Rick is driving to his uncles house in greenville,which is 120 miles from ricks town .after covering x miles rick she's a sign stating that greensville is 20 miles away. which equation when solved will give the value of x. a: x+120 = 20 b: x x120 =20 c: x +20 equals 120 d: x x20= 120