book Maths Puzzle Numerical Ability

a chemist has two alloys one of which id 10% gold and 15% lead and the other of which is 30% gold and 40% lead. how many grams of each of the two alloys should be used to make an a

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Please, I need help with these problems. I confused on how to get started on it,
a)3y^2-4y-4

b)2x^2+12x-7=-2

c)[(x/3+4)]^2=27
marie i would like to know who to figure out what the measure of a regular pentagon is (so the formula to find the total number of the angles in a polygon)