book Maths Puzzle Numerical Ability

N is 16 less than 2K
K is 2 more than N
What is the value of N

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book Other Question

The sum of 7 times a number and 7 divided by 2 is 14? 2 investments made produce an annual income of $4200.amount invested at 14% is $6000 less tha amount invested at 10%. find amount invested at 14%