10 less than a number K equals five

What’s the equation???

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45 was divided by a power of ten to get 4.5. what power of ten was it divided by? people 4.5

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