英语智力题1.Let a be the average of all odd prime numbers less th

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英语智力题
1.Let a be the average of all odd prime numbers less than 50.The inreger,most close to a is()
2.The students in Class 3 are making kites If all the students take part in it,each of them makes 6 kites .If only boys do it ,each of them makes 9 kites .If only girls do it ,how many kites dose each girl need to make?
3.The lights on three lightships flash at regular intervals.The first light flashes every 12 seconds,the second every 27 seconds and the third every 90 seconds.The three lights flash together at 09:00.At what time do they next flash together?

1.翻译：a是小于50的所有奇素数的平均数.问与a最近的整数是什么?
答：a=(3+5+7+11+13+17+19+23+29+31+37+41+43+47)/14=23.29.
所以答案是23.
2.翻译：3班的学生在做风筝,如果所有的学生都做,则每人做6只.如果只有男生做,则每人做9只.问如果只有女生做,每人需做几只?
答：设男生x人,女人y人.可列：6(x+y)=9x,解得x=2y,可知男生人数为女生的2倍,所以只要女生做,每人需比男人做两倍的,为18只.
所以答案是18只.
3.翻译：三个灯塔闪烁都有一个有规律的间隔.第一个灯塔每12秒闪一次,第二个每27秒闪一次,第三个每90秒闪一次.在九点三个一起闪,问下次一起闪要在什么时候?
答：求12秒,27秒,90秒的最小公倍数为3240秒,化为分钟为54分.
所以答案是09:54:00.
再问：还有一题能解答吗？ the sum of n diffrernt natural number is less than 50.the greatest possible value of n is 在帮忙翻译一下，谢谢！
再答： n个不同的自然数的和小于50.问n最有可能的值是多少？有很多种可能吧
再问：哦，我算出来了，谢谢！

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