Can you solve it? Chicken or egg

Brain games from a master puzzler

UPDATE: To read the answers click here

Today's column is a tribute to Ivan Moscovich, a legend in the world of puzzles, who died last week aged 96. Ivan was a prolific inventor of toys and games, a pioneer of interactive science museums and a bestselling author of puzzle books. The following questions are taken from his magnum opus, The Big Book of Brain Games, which sold around half a million copies.

(More about Ivan's amazing life below.)