exam Maths Puzzle Numerical Ability

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.

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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 how do you find the process to a equation cause on my homework i got a table and we have to find the process and my teacher told me that we have to find the diferen between x and y