求指导，一道OG题，看了半天解释也不明白

Rosera

假设是说一个幼托班的师生比，学费和学生出勤情况

有一个题目问下周跟这周的师生比有什么差别……解释部分说了很多多少个学生从两岁班进入三岁班，多少个从三岁班进入四岁班……但是我盯着表格看了半天，也还是不明白这是咋看出来的

求指导TAT

假设部分：

The ChildCare Center (CCC) is a medium-sized child care facility that offers daytime supervision and instruction on weekdays (Monday through Friday) for children up to the age of 5. There are many children who attend CCC every weekday, and a relatively small number attend fewer than 3 days per week.

The classroom assignment and daily fee paid to CCC for each child are determined by the child's age on Friday of the previous week.

CCC

The ratio of the number of classroom staf in a particular classroom to the number of children in that classroom is subject to local regulations—certain minimum staff-to-child ratios are to be met or exceeded in every classroom. The minimum ratio for a particular classroom is determined by the age of the youngest child in the classroom. The table shows these minimums. Each day CCC assigns to each classroom the least number of staff members needed to comply with the local regulations.

The table shows the daily attendance at CCC for Week 2 of a recent fiscal year. The roster of children attending CCC—as well as the days of the week each child attended—was unchanged from Week 1 through Week 3.

题目部分：

GMAT.IR.0020

For each of the following classrooms, select More staff if more classroom staff members were assigned to that classroom on the Monday of Week 3 than on the Monday of Week 2. Otherwise, select Same/fewer staff

	More staff	Same/few staff
A			Twos
B			Threes
C			FourFives

答案分析部分：

A: Apply

According to the information on the Week 2 Enrollment tab, on Monday of Week 2 there were 9 children in the Twos classroom. During Week 2, as of Friday one child had turned 2 and another child had turned 3. The CCC tab indicates that a child's classroom assignment is determined by her or his age on Friday of the previous week, so the number of children in the Twos classroom was the same on Monday of Week 3 (9 + 1 – 1 = 9) as it was on Monday of Week 2. The Regulations tab indicates that CCC assigns the minimum number of staff necessary to comply with regulations, so the number of staff assigned to that classroom would have been the same on Monday of Week 3 as it was on Monday of Week 2.

The correct answer is Same/fewer staff.

B: Apply

On Monday of Week 2 there were 15 children in the Threes classroom. During Week 2, as of Friday one child had turned 3 and four children had turned 4. Given that a child's classroom assignment is determined by her or his age on Friday of the previous week, on Monday of Week 3, there were 12 children (15 + 1 – 4 = 12) in the Threes classroom. Furthermore, given that the required ratio of staff to children in the Threes classroom is 1:10, and that CCC assigns the minimum number of staff needed to comply with regulations, we can calculate the number of staff assigned to the Threes classroom for each Monday by dividing the number of children in the Threes classroom by 10 and rounding up to the nearest whole number.

Monday of Week 2: <span class="MathJax_PHTML" id="MathJax-Element-351-Frame" tabindex="0" data-mathml="1510=1.5" role="presentation" style="position: relative;">1510=1.51510=1.5, for 2 staff.

Monday of Week 3: <span class="MathJax_PHTML" id="MathJax-Element-352-Frame" tabindex="0" data-mathml="1210=1.2" role="presentation" style="position: relative;">1210=1.21210=1.2, for 2 staff.

Therefore, the same number of staff was assigned to the Threes classroom for Monday of Week 2 and for Monday of Week 3.

The correct answer is Same/fewer staff.

C: Apply

On Monday of Week 2 there were 12 children in the FourFives classroom. During Week 2, as of Friday four children had turned 4 and no children turned 5 or 6. Given that a child's classroom assignment is determined by her or his age on Friday of the previous week, on Monday of Week 3 the FourFives classroom had 16 children (12 + 4 = 16). Furthermore, given that the required ratio of staff to children in the FourFives classroom is 1:13, and that CCC assigns the minimum number of staff needed to comply with regulations, we can calculate the number of staff assigned to the FourFives classroom for each Monday by dividing the number of children in the FourFives classroom by 13 and rounding up to the nearest whole number.

Monday of Week 2: <span class="MathJax_PHTML" id="MathJax-Element-353-Frame" tabindex="0" data-mathml="1213≈0.92" role="presentation" style="position: relative;">1213≈0.921213≈0.92, for 1 staff.

Monday of Week 3: <span class="MathJax_PHTML" id="MathJax-Element-354-Frame" tabindex="0" data-mathml="1613≈1.23" role="presentation" style="position: relative;">1613≈1.231613≈1.23, for 2 staff.

Therefore, more staff were assigned to the FourFives classroom for Monday of Week 3 than were assigned to that classroom for Monday of Week 2.

The correct answer is More staff.

rsdrydwjyxhg

+1我也是
之后的小题也是。。。根本不知道哪里来的信息

vipalbee123

+1 有人能解释一下吗 完全看不出来

elenaln

同意。。。實在看不懂

你的男孩WW

这种题目要是做对了会不会扣分啊...

JackyG

我也是，没明白！主要是这一部，不明白，是怎么得出这样结论的。
A中：During Week 2, as of Friday one child had turned 2 and another child had turned 3.
B中：During Week 2, as of Friday one child had turned 3 and four children had turned 4.
C中：During Week 2, as of Friday four children had turned 4 and no children turned 5 or 6.
OG的答案中，直接给出这些结论，而中间是怎么得出来的，没有说，是不是他们/我们漏掉了什么信息？怎么就知道有几个孩子在第二周的星期五就变成2，3，4岁了？