need help 十月JJ, 谢谢

kay

这几道题很是不明白, 谢谢高手帮助! 请给我讲一下解题思路好吗? 1.Some city in 1984. 40% population own computers. In 1990, the population owns computers increased 30% (Which means 40% of P), while the total population(which means the total P in 1984) increased 4%. What is the percentage of population who own computers? 2.DS: 45% the apartments with <=3 people living in each one. What’s the median? (1)80% of the apartments have <=5 (2)35% of the apartments have >=5 ###(C) Note: Median is 4

tongxun

2、条件1）中数可为4、5
   条件2）中数为4。
画个数轴试试。
1、总数原来是X。
现在有电脑的人数：X * 40%（1+30%）
现在总人口：X*（1+4%）
比例：[X * 40%（1+30%）]/[X*（1+4%）]