There are 1200 students in a school, and a third of them are boys. Study the following pie charts about the distribution of girls alone and students overall of a school in six different courses (A, B, C, D, E and F), and answer the questions that follow:
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Question 1
For course D, what is the ratio of number of boys to that of girls?
(A) 3:4
(B) 4:5
(C) 3:5
(D) 5:6
Question 2
For which pair of courses is the number of boys the same?
(A) E and F
(B) A and D
(C) C and F
(D) B and D
Question 3
For course E, the number of girls is what percent more than the number of boys?
(A) 250%
(B) 350%
(C) 150%
(D) 80%
Question 4
For which course are the number of boys the minimum?
(A) E
(B) F
(C) C
(D) A
Question 5
In how many courses to girls outnumber boys?
(A) 2
(B) 3
(C) 4
(D) 5
SOLUTIONS TO DAILY CSAT MISSION # 26
1. (B) 2. (B) 3. (D) 4. (B) 5. (C)
Explanations
1. April showed a change of 9 percentage points over the previous month.
2. Percentage change in March = (11 – 13)/13 * 100 = -15%
Percentage change in April = (20 – 11)/13 * 100 = 82%
Percentage change in June = (13 – 12)/13 * 100 = 8%
Percentage change in July = (20 – 13)/13 * 100 = 54%
April shows the greatest percentage change as well.
3. Percentage change in March = (11 – 13)/13 * 100 = -15%
Percentage change in April = (20 – 11)/13 * 100 = 82%
Percentage change in May = (12 – 20)/13 * 100 = -62%
Percentage change in June = (13 – 12)/13 * 100 = 8%
June shows the smallest percentage change over the previous month.
4. The rate at the beginning (January) = 13%. The rate at the end (July) = 20%. Net rise = 7%. Percentage rise = (7/13)*100 = 54%.
5. Average rate = (13 + 13 + 11 + 20 + 12 + 13 + 20)/7 = 14.5%
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