book Maths Puzzle Numerical Ability

Adam,Imram and Shakeel were playing a card game.
Adam scored x points
Imram scored 3 points fewer than Adam
Shakeel scored twice as many points as Imram
Together they scored 39

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book Other Question
If they give you a problem that said dreaw on the number like that flooling set [-2,7) upside down U [5,10]
what does the u or upside down u mean Hello, I need help I was told to simplify.
5 sqrt 12+6 sqrt 1/3 - 3 sqrt 48
Thank you