The answer to last week’s Mental Floss is Q: Three spiders named Mr Eight, Mr. Nine & Mr Ten are crawling on an activity board in a Govt Dept. One spider has 8 legs, one has 9 and the other has 10. “I think it’s interesting..” says Mr Ten, “..that none of us have the same number of legs as our names would suggest.” “Who the heck cares?” replies the spider with 9 legs. How many legs does Mr Nine have ?
A: Mr Nine has 10 legs. Why ? Mr Ten can’t have 10 legs, so he must have either 8 or 9. The spider with 9 legs replies, so Mr Ten cannot have 9 legs either. Therefore Mr Ten has 8 legs. Now consider the spider with 9 legs, he can’t be Mr Nine as the number would match his name, nor 8 because Mr Ten has 8, so he must have 10.
This week’s thinking challenge is …
Q: You have a large box that gets lighter when you put something in it. The more you put in it the lighter it gets. What are you putting in the box?
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Enjoy the weekend!