exam Maths Puzzle Numerical Ability

4+2m-m

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exam Other Question

an electrician can install the electric wires in a house in 14 hours.a second electrician requires 18 hours. how long would it take both electricians, working together, to install the wires? solve for x:

1) a/b(2x-12)=c/d

2) a-c/x-a=m