book Maths Puzzle Numerical Ability

In a science course, you must average 89 for an A. your first three tests were 75,95,91. If you only have one test remaining, what score do you need for an A?

two more please:

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book Other Question

Twenty five sets of problems on data interpretation each for the DI section of 25 CATALYST test were prepared by the AMS research team. The DI section of each CATALYST contained 50 questions of which exactly 35 questions were unique, i.e. they had not been used in the DI section of any of the other 24 CTALYSTs. What could be the maximum possible number of questions prepared of the DI sections of all the 25 CATALYSTs put together???
a)1055
b)975
c)1070
d)1100 1.factor completely (5x^2+14x+13)^2-16((x^2+x-2)^2
2.factor out x^3+x^4y^4+y^6
3.a square has a perimeter of 12x+28cm.find its area.
4.a circle has a radius of 3x-5cm.find its a