book Maths Puzzle Numerical Ability

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)

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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 the second side of a triangle is 8cm greater than four times the first side. the third side is two times the first side increased by six. if the perimeter is 68cm, how long is each