exam Maths Puzzle Numerical Ability

How many grams of pure salt must be added to 40 g of a 20% salt solution to make a solution that is 36% salt?

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exam Other Question

Will a single sheet of paper which measures 28.25" by 25.5" be enough to wrap a box which is a foot long, a foot wide, and a foot high?

I have tried everything i just cant figure out this problem.
please help me.
graph the two lines y1=3*-5 and y2=-7x+4on the same graph. use algebra to find the coordinates of their point of intersection to 3 decimal places