The Weekly Warlock Wind-Up: Shopping

At a shop, the first 15 customers of the day spent an average of £3 each. After a further 30 customers the average amount rose to £9. What was the average amount spent by the last 30 customers only?

You have until Friday – good luck!



4 Responses to “The Weekly Warlock Wind-Up: Shopping”

  1. Mishaweha Says:

    I got 12. Of those wossnames. Pounds.


    (I thought of them as dollars while doing the problem. Sorry! XD)

  2. Nigel Says:

    I got 12 of that crazy heavy currency as well ;).

  3. Dila Says:

    £12 🙂 That was like statistics revision, a little too late 😛

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