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Four Houses at an Intersection
At a + shaped intersection, four different-coloured houses are at the four corners of the intersection so that each house is separated by a road. All you know about the colours of the houses is:
1. The blue house is directly north of the purple house.
2. The orange house is directly west of the green house.
What colours are the two houses that are across the road from the green house?
Answer:
Purple and blue.
It is impossible for north to align with the roads, but if north is across the diagonal then it works out. If north went in the direction from the bottom left to the top right of the + intersection, then the blue house would be in the top right corner, the orange in the top left, the purple in the bottom left, and green in the bottom right.
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