Math Is Fun Forum

I got the same solution as keith_27, charmaine and JaneFairfax.

The key assumption I made that turns out to be part of this solution is that the green house is ADJACENT to the white one.  In American English, at least, the statement "the green house is to the left of the white one" would be true even if the green one were #1 and the white one were at #5.  Maybe this is more clear in British English.