CU­RI­OUS AND IN­TER­EST­ING

The Sunday Telegraph - Sunday - - Front Page -

A SE­RIES OF MATHS-BASED PUZZLES BY DAVID WELLS 1. The Frog in the Well A frog had fallen into a well and was try­ing to climb out. Ev­ery day he climbed 10 me­tres, but ev­ery night he slipped back five me­tres. If the well was 50 me­tres deep, how long did he take to climb out of the well? An­swer at foot of col­umn. 2. Tis­sue of Lies Peter was fold­ing up a large sheet of tis­sue pa­per left over from Christ­mas presents. “Isn’t it thin?” said Mark. “You’ve folded it in half three times but it hardly seems any thicker.” “I bet if I folded it 30 times, it would be quite thick,” said Peter. They looked at a pile of tis­sue pa­per, and saw that 10 sheets to­gether were 1mm thick. “I think if you folded that sheet in half 30 times, it would be about five cen­time­tres thick, or 50mm,” Mark guessed. “I would say 10 cen­time­tres thick, or 100mm,” said Peter. Who was clos­est? Can you cal­cu­late the ex­act thick­ness? An­swer at end of Puzzles. From Mind­ben­ders and Teasers by David Wells and Rob East­away, pub­lished by Por­tico

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