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Convergence articles

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There is a tree with 100 branches. How many nests, eggs and birds are there?
Two bicyclists travel in opposite directions around a quarter-mile track and meet every 22 seconds. When they travel in the same direction on this track, the faster passes the slower once every 3 minutes and 40 seconds. Find the rate of each rider
If 12 cattle eat up 3 1/3 acres of meadow in 4 weeks and 21 cattle eat up 10 acres of exactly similar meadow in 9 weeks, how many cattle shall eat up 36 acres in 18 weeks? (Hint: The grass continues to grow.)
Now there is a wall 5 feet thick and two rats tunnel from opposite sides.
A ladder is placed perpendicular to the plane of the horizon, and in coincidence with the plane of an upright wall.
An English translation of Eratosthenes' Geography, which includes "On the Measurement of the Earth."
A teacher agreed to teach 9 months for $562.50 and his board. At the end of the term, on account of two months absence caused by sickness, he received only $409.50. What was his board worth per month?
The history of apportionment of representatives in the U.S. Congress, from the 1790s until today, along with a discussion of the mathematics involved in the various methods.
There are two numbers whose sum equals the difference of their squares.
Poster picturing five famous women, from Hypatia to Grace Hopper.