exam Maths Puzzle Numerical Ability

How do I solve this rational equation:(x+1)/x + (x+4)/x =6

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exam Other Question

Please answer and explain,

The fixed cost for a widget is $43, with a variable cost of $81. How much would it cost to produce 200 widgets?

Thank you for providing the cost. There is an arch above a door frame. The door frame is 9 feet wide and the arch is 3 feet high. Find the diameter of the circle?