0. CHAPTE R ZER O
3
digits ar e code d wit h equa l letters , an d differen t digit s wit h differen t letters . Tw o
giant computer s cam e u p wit h tw o different answer s t o th e riddle . I s this possibl e
or doe s one of them nee d repair ?
Problem 19. Distribut e 127 one dolla r bill s amon g 7 wallets s o that an y intege r
sum fro m 1 through 127 dollars ca n b e paid withou t openin g th e wallets .
Problem 20 . Cu t th e figure show n i n Figur e 2 into fou r figures, eac h simila r t o
the origina l with dimension s twic e a s small .
FIGURE 2
Problem 21. Matche s ar e arrange d t o for m th e figure show n i n Figur e 3 . Mov e
two matche s t o chang e thi s figure int o fou r square s wit h side s equa l i n lengt h t o
one match .
FIGURE 3
Problem 22 . A river 4 meters wide makes a 90° turn (se e Figure 4). I s it possibl e
to cros s the rive r b y bridgin g i t wit h onl y two planks, each 3. 9 meters long ?
D^
FIGURE 4
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