book Maths Puzzle Numerical Ability

Solve the syestem
2x-y-z=7
3x+5y+z=10
4x-3y+2z=4

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book Other Question

(1y)2+14=-2 How many gallon of milk with 4% butterfat must be mixed with 3 gallons of cream with 20% butterfat to produce milk milk containing 5% butterfat.