T5W3 Maths challenge

May 042020
 

A toilet roll company wants to encourage recycling – so they say if you keep the cardboard tubes they will exchange 8 of them for 1 new toilet roll.

I have saved up 71 carboard tubes – what is the maximum number of toilet rolls that I can get without buying any more?

(The answer isn’t 8)

Problem by Chris Smith

  3 Responses to “T5W3 Maths challenge”

  1. Zachary says:
    4th May 2020 at 10:52 am

    9

    Reply
  2. Oliver G says:
    5th May 2020 at 12:21 pm

    I think the answer is 9 because 64 divided by 8 is 8 and you need 8 to get 1 more so you will have a total of 9.

    Reply
  3. Noah Ha says:
    10th May 2020 at 11:20 am

    10

    The first time you have to take away 8 from saved cardboard tubes so 71-8=63 then you have 1 extra whole toilet roll. Then you only have to take 7 away each time because you have the extra toilet roll from earlier. 63/7=9 and you have the one from the beginning so you have 10

    Reply

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