Question 1200077
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#1
From the total number of marbles:  g + b = 57
And from "there are 17 more green marbles than blue..." :  g = b+17

From the above, substitute for 'g' in the first equation: 
         (b+17) + b = 57  
            2b + 17 = 57
                 2b = 57 - 17 = 40
                  b = 40/2 
                  b = 20   -->  g = 37   

There are 20 blue marbles and 37 green marbles in the bag.

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#2   Please post as a separate problem, as the forum requires you supply one problem per post.