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Maths Puzzle
Numerical Ability
What do lenths have to do with this?
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2x+5y+z=39
3x-2y-z=1
2x+y+3z=27
An herbalist has 30 oz of herbs costing $2 per oz. How many ounces of herbs costing $1 per oz should be mixed with the 30 oz to produce a mixture costing $1.60 per oz.
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