exam Maths Puzzle Numerical Ability

will you please solve this problem for me it will be greatly appreciated:

solve: (n)/(n-3) + n=(7n-18)/(n-3)

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exam Other Question

A says to B,"i am three times old as you were when i was as old as you are."the sum of their present ages is 64 years.find their ages. Two cars leave an intersection at the same time. One travels north, and the other heads west traveling 10 mph faster. after 1 hour, they are 50 miles apart. What are their speeds?