book Maths Puzzle Numerical Ability

This new math sure gets me. I am a senior and trying to answer this question.
[2x(9+7)-4]/7=
Thank you.

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book Other Question

Find a counter-example to the statement 4^n+1 is divisible by 5.

Thank You A box with a square base no top is to be made from a square piece of tin by cutting out a 3cm square from each corner and folding up the sides. If the box is to hold 48cm3, what size piece of tin should be used.