book Maths Puzzle Numerical Ability

please solve this equation: 4 - x/3 < x, thank you

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Chaundra is two years older then her brother. She is four years younger then her older sister. Her two parents are each forty-one. The total of all five ages is one hundred twenty-three. How old is Chaundra? A race track measures 8 miles long. If an automobile completes the track in exactly 3 minutes, what is its average rate of speed in miles per hour?