book Maths Puzzle Numerical Ability

x-3y+3z=-4
2x+3y-z=15
4x-3y-z=19

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book Other Question

You need .3 mg You already have 0.2g/300g of powder. How much powder of you need to make that .3mg? G,day, please, could you help me with this problem?

A company produces large stuffed toys to be sold to showground operators as prizes. The following costs are involved:
Factor