exam Maths Puzzle Numerical Ability

Could you please help me solve this problem?

Number problems. If the square of 2 less than an integer is 16, find the number(s).

Thank you,

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exam Other Question

2x-6=3(x-1) If you need to mix 5L of fluid containing 25%alcohol and you have one that
cotains 50%alcohol and another with 15%alcohol how much of each do you need
to mix.