#149 All in a spin
Fairground designer Ferris Caroselli has designed a new ride. Six teacups, each with seats for passengers, spin around a giant stationary dinner plate. Each cup sits on a cog that is 1 metre in diameter, which meshes with a 5-metre diameter cog under the plate, so that the cups spin without slipping.
A mother watched her children on the ride, and counted how often they spun around in one full circuit of the plate. She was slightly surprised at the answer. How many times was it?
#148 Much ado about muffins
Solution
2520 muffins. The…
