September Mindbenders

Lost Money

Three friends ate together at a restaurant.  The bill came to £30, and so each of them handed the waiter a £10 note.

When the waiter took the £30 to the cash desk, it was discovered that the total cost of their meals should have been £25.  The cashier gave the waiter five £1 coins to take back to the diners.

On his way back to the table, the waiter started to have dishonest thoughts: “Should I give the money back?  How would I split £5 between three people, anyway?”  So he pocketed £2 and gave the three friends back £1 each.

But something seems wrong.  The diners each got £1 back, so their meals cost them £27 in total.  The waiter had pocketed £2, making a total of £29.  But they had originally handed over £30.  What’s happened to the other pound?

Answer

Spot the Intruder

Which word doesn’t belong in each line?

  1. black, engine, jumbo, lag, stream
  2. exercise, cheque, foot, story, text
  3. cycle, jacket, science, sentence, size, still

Answers

Continue the Sequences

  1. 26, 31, 35, 39, 40, ?
  2. 1, 2, 3, 6, 11, 20, 37, ?
  3. 307, 311, 313, 317, 331, 337, ?
  4. 1, 4, 9, 25, 64, 144, ?

Answers

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