exam Maths Puzzle Numerical Ability

Can anyone help me with the following problem?

The LORAN system (LOng RAnge Navigation) uses two radio transmitters 26 miles apart to send simultaneous signals. The navigator on

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exam Other Question

How do you subtract this the rational expression:x^2/x-1 - 1/x-1? The sum of two numbers is 21. the first number is 3 more than twice the second. set up a system of equations and solve it by elimination to find the numbers.