一零七 Three people at work. The salary are X, 2X per hour, and 3x, respectively, for the level1 and level2 and level3. Q is how many more minutes the level1 has to work in order to get 1 dollar level3 work if both level1 and level3 work in one hour(not sure how the sentence made)?1) Level 1 is 10.5$ per hour2) Level2 to level3 is ??(提供者ID:jannyguo 。)
一一四 The average of schools from 9.8 from different district, and there are 49 districts. Even school has 22 teachers. Q – how many teacher in the area to the most closest of which choice? 说不同的区,平均有9.8个学校,有49个区,每个学校有22个老师。问一共多少老师,是估算。 9.8*49*22 把9.8估算成10 把49估算成50。一定能得出答案。 就是11000.在答案中找一个和这个相近,然后比这个小一点的。比如说,很变态的一种情况,给了两个选项,分别是10999和11001,那么选10999。因为估算时,我们把式子中的两个数都放大了。