Ryan and Andy both live 2 blocks away from each other
Wanna know how?
Hence the fact, that Ryan lives 2 west and 5 blocks south
In total that's 7 blocks.
Then we have Andy who lives 7 blocks eats and 2 blocks
In total that's 9 blocks
The key word in the sentence is how far and live from each other
Which gives us a hint we subtract
Simply subtract 9-7
Which will give you 2.
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