18 but can't believe I missed the eight-sided stop sign.
Speaking of merry-go-rounds running counter-clockwise, it reminded me of a classic think test.
A man comes into a paint store wanting to know if a gallon of deck paint (400 sq ft of coverage) would paint the floor of his merry-go-round. The only measurement he brings is that from one side to the other barely touching the inner wheelhouse being 20 feet (see diagram).
The man behind the counter isn't sure and wishes that his customer would have measured around the inner wheelhouse and the distance straight out from the wheelhouse to the edge. Can you help him figure it out or does he need a second measurement?
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