book Maths Puzzle Numerical Ability

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

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book Other Question

x-3y+3z=-4
2x+3y-z=15
4x-3y-z=19
(x^2+x-20) (x^2+10+25)
_________ divide __________
(x^2-7x+12) ( x^2-6x+9)