exam Maths Puzzle Numerical Ability

find x,y and z in each figure.

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exam Other Question

A company has a set limit of at most $450 to be spent on its monthly electric bill. If electricity costs $0.12k/kW, find the number of kilowatts the company can use each month. What does it mean when you have a sum, say for instance: y=2x+10 and it asks you what the value of x is?
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