The of is essentially the multiplication operator hence

Hope this helps.
Answer:
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Step-by-step explanation:
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The correct answer is 21.5
220 miles is how much Mrs. Johnson drove. because . . .
2x+x=330
2x is twice the amount of Mr. Johnson which equals Mrs. Johnson.
The plain "x" is how much Mr. Johnson drove.
2x+x= 3x
3x=330- x=110
If 'x' is how much Mr. Johnson drove then we multiply that by two to get 220.