Yes it is;
The key is to understand that this question requires you to breakdown and assimilate confusingly represented data.
In such cases putting down the logic / data points into manageable bits in your scratch pad/paper will help immensely.
Here's what the data says (I'm assuming that 1997's student strength is 100)
We know that
Pass = 80
Fail = 20
But in 1998 number of pass reduced by 10% of previous year: therefore total number of pass = 72
(note that they haven't told us what the total number of students is)
So let's account for all possibilities:
Student population of 1998 was 1. lower, 2. same, 3. more
Let me assign numbers
1. 80 then
Pass = 72
Fail = 8
2. 100
Pass = 72
Fail = 28
3. 200
Pass = 72
Fail = 128
Now let's look at the options:
A. If the percentage of high school seniors who passed the exam increased from 1997 to 1998 , the number of high schools seniors decreased during that time period.
this refers to the second case and this statement is TRUE B. If the percentage of high school seniors who passed the exam decreased from 1997 to 1998 , the number of high schools seniors increased during that time period.
This is not necessary since if % of passing decreased - total could be equal OR moreC. Unless the number of high school seniors was lower in 1998 than in 1997, the number of seniors who passed the exam in 1998 was lower than 80 percent.
Case 1 - TRUED. If the number of high school seniors who did not pass the exam decreased by more than 10 percent from 1997 to 1998, the percentage of high school seniors who passed the exam in 1998 was greater than 80 percent.
This is TRUE - extrapolation of case 1E. If the percentage of high school seniors who passed the exam in 1998 was less than 70 percent, the number of high school seniors in 1997 was higher than the number in 1998.
This is TRUE - case 3Hope that clarifies things!
Ajeeth Peo
Verbal Trainer -
CrackVerbalProbably, the best explanation to this problem. Thanks!