#171 The magic number bracelet
鈥淗ere鈥檚 your 21st birthday present,鈥� said Amy.
鈥淎 bracelet?鈥� frowned Sam.
鈥淣ot just any bracelet, it is a magic number bracelet because I know you love numbers. See how it has got five beads, each with a different positive number on it. You can find all the numbers from 1 to 21. But to find most of them, you have to add together adjacent beads.鈥�
鈥淔or example, to make the number 17 you add together these three beads,鈥� she said, pointing to the beads in positions A, B and C on the diagram. 鈥淥ther numbers are found by adding two, three or four adjacent beads. And, of course, to get 21, you add up all five.鈥�
What are the five numbers on Sam鈥檚 bracelet?
Solution next week
#170 Presents, but not correct Solution
Amelia 鈥� lip balm; Beth 鈥� sunglasses; Clara 鈥� book; Diaz 鈥� nail varnish; Elinor 鈥� pencils.
Kayleigh scores better with each guess, so at least two of her third guesses are right.
Clara can only be nail varnish or book, and since at least one of the second guesses is correct, it quickly emerges that only two of the third guesses can be right: that Amelia gave lip balm and Beth gave sunglasses.
The rest follows.
Quick quiz #155
1 What is the only known comet that can be seen twice in one lifetime with the naked eye?
2 Which Scottish doctor pioneered the theory that citrus fruit alleviates scurvy?
3 Where in the body would you find a Sertoli cell?
4 Plants of the Dionaea, Sarracenia and Nepenthes genera share which trait?
5 In zoology, which major rank in the taxonomic hierarchy comes between kingdom and class?
Answers
1 Halley鈥檚 comet
2 James Lind
3 The testicles
4 They are carnivorous
5 Phylum