（1）n的1/3跟n+4一样大,求n?
（2）一条摩托艇以18英里每小时穿过这个湖比用12英里每小时穿过少用时15分钟,问这个湖有多长
（3）乔治花25%的钱吃午饭,60%的钱存着吃晚饭,当他吃完午饭后他还有9块钱,问他花了多少钱吃午饭?
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if 3 times a less than a number n is the same as the number
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