At Jefferson Elementary School, the number of teachers and students (kindergarten through sixth grade) totals 510. The ratio of students to teachers is 16 to 1. Kindergarten students make up 1/5 of the student population and fifth and sixth graders account for 1/3 of the remainder. Students in first and second grades account for 1/4 of all the students. If there are an equal number of students in the third and fourth grades, then the number of students in third grade is how many greater or fewer than the number of students in kindergarten?
12 greater
17 fewer
28 fewer
36 fewer
44 fewer
The explanation in the CAT, was good. my question is what should one do, when facing this kind of question.
When I saw this question, I thought "there are to many calcs that can go wrong, and it will take me no shorter then 2 min to solve it. I rather guess and use the time to make sure the next 2 or 3 questions are correct".
Somehow I managed to spend over 5 minutes trying to calculate all these spare parts. Unacceptable I know. BTW the answer is 28 .
12 greater
17 fewer
28 fewer
36 fewer
44 fewer
The explanation in the CAT, was good. my question is what should one do, when facing this kind of question.
When I saw this question, I thought "there are to many calcs that can go wrong, and it will take me no shorter then 2 min to solve it. I rather guess and use the time to make sure the next 2 or 3 questions are correct".
Somehow I managed to spend over 5 minutes trying to calculate all these spare parts. Unacceptable I know. BTW the answer is 28 .
