book Maths Puzzle Numerical Ability

Evaluate

5 times 4 divided by 2 - 4^2

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I dont understand how to do this question. Can i please get some help, with information how to answer the question aswell, thanks.

Solve the following.
5 = 9
3 2-y
( i Please help me solve for A: 2A/3=8+4A? Thanks