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If $\frac {a + b}c = \frac 65$ and $\frac {b + c}a = \frac 92,$ then what is the value of $\frac {a + c}b?$
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Five monkeys in a circus are sitting in the following order:
The ringmaster wants to reverse their order, but only by swapping the positions of two monkeys at a time.
This is one way, where two swaps take place:
1 2 

Another possible way takes exactly four swaps:
1 2 3 4 

Is it possible to do this in exactly three swaps?
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The blue figure is made of five quartercircle arcs (each with integer radius) and a segment of length 4, which is the base of a $4\times 4$ square grid.
What is the area of the blue figure?
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An infinite triangular lattice consists of points spaced 1 unit apart.
What is the probability (as a percentage) that a circle of unit diameter placed randomly in the lattice encloses no lattice points, as shown?
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$\frac 1{1},\ \frac {2}{1},\ \frac {1}{2},\ \frac {3}{1},\ \frac {2}{2},\ \frac {1}{3},\ \frac {4}{1},\ \frac {3}{2},\ \frac {2}{3},\ \frac {1}{4},\ \ldots$
If $\frac {1887}{1920}$ is the $m^\text{th}$ term and $\frac {1789}{2018}$ is the $n^\text{th}$ term of the sequence above, find $mn.$
Note: In this sequence, the fractions do not reduce. For example, $\frac{2}{2}$ is distinct from $\frac{1}{1}.$
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