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

what is the circumference of a circle with a diameter of 6cm? Sarah is visiting a friend about two miles away from her house. She sees a hot-air balloon directly above her house. Sara estimates that the angle of elevation formed by the hot-air balloon is about fifteen degrees. About how high is the hot-air balloon?