We had very clearly explained solutions to Ten Green Bottles. David from Tithe Barn Primary School, Stockport wrote:
The answer is that the last bottle fell at five minutes to six. I worked this out by writing down the numbers 1-10 and by the first number I put the time when it fell. Then, I added 5 minute intervals and put them at the next number down i.e. 5:10, 5:15, 5:20 etc.
Jeff from Kelly Elementary School in Carlsbad, California agreed with the answer of 5.55.
Airlangga from St Joseph's Catholic Primary School wrote:
5.10 + (5minx9) = 5.55
Alistair from Histon and Impington Infant School used a similar way of working it out to David, but then generalises, leading nicely on from Airlangga's response:
I have spotted that the equation for the nth bottle is 5 x(n-1) minutes after 5.10
Very well thought out all of you.