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Points
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National Level Test
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1. The squares in the diagram have side length
1. What is the area of the slanted rectangle?
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2. The positive integers 30, 72, and N have the property
that the product of any two of them is divisible by the
third. What is the smallest possible value of N?
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3. Two sisters go up 40-step escalators. The older sister
rides the up escalator, but can only take 10 steps up during
the ride since it is quite crowded. The younger sister runs
up the empty down escalator, arriving at the top at the same
time as her sister. How many steps does the younger sister
take?
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4. Michael Jordan's probability of hitting any basketball
shot is three times greater than mine, which never exceeds a
third. To beat him in a game, I need to hit a shot myself
and have Jordan miss the same shot. If I pick my shot
optimally, what is the maximum probability of winning which
I can attain?
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5. Let b equal the square root of 3. Line l is given by the
equation y=bx, and line m by x=by. Set S has the property
that for any point P in S, the reflections of P in lines l
and m are also in set S. If S contains the point (6,5), what
is the smallest number of points S could contain?
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6. Suppose that P(x) is a quadratic function (polynomial of
degree two) such that P(0)=cos340, P(1)=(cos
40)(sin240), and P(2)=0. Evaluate P(3)
numerically.
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7. A quadrilateral inscribed in a circle has side lengths
whose squares are 17, 99, 19, and 97. Find the area of the
circle.
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Nat Level Soln
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