This is on the Mensa home test and got me stumped too. The others were easier enough and managed to score 117 in the home test, using strict time limit and conditions. Got 100% on the online UK Mensa test which prompted me to do the home test. Bet the supervised test will be completely different but figure if I could work these ones out it might push my score up to the level needed. Revisting some questions I think I spotted mistakes later on but was pushed by time.