exam Maths Puzzle Numerical Ability

A camcorder that regularly sells for $900 is on sale for $750. Find the discount rate.

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exam Other Question

w+3x-y+2z =-4
w-2x+3y+5z=-3
3w+2x+y+z=9
2w-x+2y+z=7

I need to know what w,x,y,and z
Please help me Im so lost. B + 3/E = F for E