exam Maths Puzzle Numerical Ability

2w-x+5y+z=-3
3w+2x+2y-6z=-32
w+3x+3y-z=-47
5w-2x-3y+3z=49

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What is the best method of turning a fraction with a decimal into a fraction that makes sense? My fraction is 10/256.21? I think I remember moving the decimal over two places to the right and then adding two zeros to the 10?
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