teaser

[alison6399]

Hi

A factory recycles cups for use in it's canteen. 8 used cups are required for each new cup. From 645 used cups, how many cups can possibly be made?

Please explain answer. Thanx

[gen2]

92 cups (80 + 10 + 1 + 1)

645 makes 80 new (+ 5 used ones left over)
those 80 new will then be used making 80 (+ 5) = 85 used ones.

85 used ones make 10 new (+ 5 used left over)
tose 10 new will become used making 10 (+ 5) = 15 used

15 used ones will make 1 new one (+ 7 left over)
That one will become used and added to the 7 used ones already left over makes 8 - enough to make one more cup.

[swannbaker]

92 being 645 divide 7 .