book Maths Puzzle Numerical Ability

please explain how to evaluate this type of problem.
(5+3)/2+2 The answer choices are 2,4,6,8

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book Other Question

Im starting out with fourteen now i subtract 4 the Multiply by 7 then i have to make up how much at divide and add How many solution does the linear system have?
1, [x+4y=9
[-2x+y=0
2, [-x+3y=3
[2x-6y=30
3, [-x+2y=16
[4x-8y=-64
Decide whether the ordered pair is a sol