Brain Teasers
Broken Ski Lift
Mad Ade is on holiday enjoying a cross country skiing and kebab hunting holiday. After a busy day, Mad Ade is returning to his hotel and using the ski lift. Half way up, the ski lift suddenly breaks down, leaving Mad Ade and several other passengers stranded. Mad Ade notices that the empty chair that has stopped opposite him on the lift was marked with the number 81. Mad Ade's chair was number 9. How many ski chairs did the ski lift contain altogether, considering that all numbers are consecutive?
Answer
144There is 71 difference between 9 and 81, so there are 71 chairs from Mad Ade's chair to the empty chair marked 81, and also another 71 from chair 81 back around to Mad Ade's number 9 chair.
71+71=142+2(chairs 9+81)=144
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