book Maths Puzzle Numerical Ability

find the actual width of the doorway into the kitchen and the dining room if the scale is 2:24 and on the drawing the doorway is 1/4 of an inch.

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book Other Question

How can you solve an equations with one variable and two numbers if they have a neggative and positive signs.It will be oky if you give me an example of how to solve an equation.If it`s not a problem if you could show step by step please and thank you. Please help me with this one. Thanks! Solve using the given root:
2z^3+z^2-8z+3=0; 3/2