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My BrainBashers electronic world atlas has developed another fault, I did a listing of miles from England to particular countries and here is the result:
Australia 500 miles
Peru 8,000 miles
India 4,500 miles
Scotland 9,500 miles
Since digit 5 is half of digit 4 we have four possibilities:
_ _ _ 2 1
_ _ _ 4 2
_ _ _ 6 3
_ _ _ 8 4
But since digit 1 is higher than the sum of digit 4 and digit 5 we can eliminate two possibilities leaving:
_ _ _ 2 1
_ _ _ 4 2
Since digit 5 is between digit 2 and digit 1, we can eliminate _ _ _ 2 1, leaving:
_ _ _ 4 2
Since digit 1 must be higher than the sum of digit 4 and digit 5 we have three possibilities:
7 _ _ 4 2
8 _ _ 4 2
9 _ _ 4 2
But digit 1 is 1 smaller than digit 3 we can eliminate 9 _ _ 4 2, leaving
7 _ 8 4 2
8 _ 9 4 2
Since digit 2 is the lowest number, it must be 1:
7 1 8 4 2
8 1 9 4 2
The answer has exactly 2 prime digits, which only leaves
7 1 8 4 2.
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