exam Maths Puzzle Numerical Ability

What is B for A=1/2h(B+b)?

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Can you help me solve my word problem...instructions...the cost in dollars of manufacturing (w)wing nuts is given by the xpression 0.07w + 13.3. Find the cost when 375 wing nuts are made. What is the average cost to manufacture one wing nut? what are the values of w,x,y, and z in these equations?

1. w + x + y + z = 2
2. 2w - x - y +2z = 7
3. 2w + 3x + 2y - 2z = -2
4. 3w - 2x - y -3z = -2