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1
Assuming that the phrase "doubled by 2" is tautological, the expression for a number multiplied by 2 (or a number doubled) is 2n.
If the number is doubles its total is doubled since its total is itself!
A case could be made for any of them, but let's go with 48. The pattern is doubled, plus three, doubled, plus three, etc.
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2
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When 20% of 60 is taken away from it, you get 48.
1
the number is 24.. 24 is one less than 25 which is 5 squared when doubled its 48, which is one less than 7 squared (49)
When 100 of anything is doubled, the result is 200 of them.
When you double any number you are in-fact multiplying it by 2 which is an even number. All even numbers are multiples of 2. When a number is doubled, it is multiplied by 2 and so the result is always a multiple of 2. Thus it must always be an even number.
The number is 48.
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The size of the United States nearly doubled