exam Maths Puzzle Numerical Ability

How many gallons of a 55% solution must be mixed with a 75 gallons of 20% solution to obtain 30% solution?

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exam Other Question

How can f(x)=|2x|-|x-| be simplified? How is written without absolute value bars. Any help will be appreciated. This is not problem from our book. The length of a rectangle is 1cm longer than its width. If the diagonal of the rectangle is 4cm, what are the dimensions(the length and width) of the rectangle?

x + (x+1)= 4

Am I on the right track in solving this problem?