Answers

2015-04-20T20:05:13+05:30
The number is 10, because, if we add 10 to it, it becomes double i.e. 20
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2015-04-20T20:21:55+05:30
Let the number be x,
When the number is doubled, it becomes 2x.
Now according to the question,
x + 10 = 2x
= 2x - x = 10 
= x = 10

Hope that helps !!
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Plz pick it as best if it was helpful !! :)