004
In Peter class there are 50 students, At a test the first 25 students get it correct and the second question 20 students get it correct. There are 12 student got both correct and how many student get both wrong?
Peter的班级中有50名同学，在一次测验中答对第一题的有25人，答对第二题的有20人，两题都答对的有12人，则有几名同学两题都不对？
005
Put the number 8 back of a number, and becames 764. What is the number?
如果把8写在某数的后面，该数就增加了764，这个数是多少？
006
The speed of the car is 36 kilometers per hour, it tooks 5 hour to reach the up of the mountain. Going down the mountain using the same track it tooks only 4 hours. Going down the mountain about how many kilometers is per hours?
汽车上山的速度为每小时36千米，行了5小时到达山顶，下山时按原路返回只用了4小时。汽车下山时平均每小时行多少千米？
007
All the fourth grader make a square maze. The outmost layer took about 60 student. How many student is in every side? What the total student is in the maze?
四年级学生排成一个方阵，最外一层的人数为60人。问方阵外层每边有多少人？这个方阵共有四年级学生多少人？
008
There is a square pool, every tree is on each corner. If every side had 6 trees, what thge total for all the side?
有一个正方形池塘，四个角上都栽1棵树，如果每边栽6棵，四边一共栽多少棵树？
009
Peter and Gavin ride bikcycle and they relative to ride at the same time, Peter's speed is 20 kilometers per hour and Gavin speed is 18 kilometers per hour. When they meet 3 kilometer away from the end of the whole,how many kilometer Peter ride to the end?
Peter和Gavin两人同时从两地骑车相向而行，Peter每小时行驶20千米，Gavin每小时行驶18千米，两人相遇时距离全程终点3千米，求全程长多少千米？
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