The number of girls studying Statistics is what percent (approxim
Directions: In a University, there are 1200 students studying four different subjects, Mathematics, Statistics, Physics and Chemistry. 20% of the total number of students are studying Mathematics, one-fourth of the total number of students are studying Physics, 320 students are studying Statistics. Three-fifth of the total number of students studying Chemistry are girls. 150 boys are studying Mathematics. 60% of the students studying Physics are boys. 250 girls are studying Statistics.
Question 1: The number of girls studying Statistics is what percent (approximate) of the total number of students studying Chemistry?
A. 58.8
B. 73.5
C. 78.7
D. 80.6
Right Answer is: B
SOLUTION
Total number of students studying chemistry = 1200 – Number of students studying Physics – Number of students studying Mathematics – Number of students studying Statistics
⇒ 1200 – ¼ × 1200 – 20/100 × 1200 – 320
⇒ 1200 – 300 – 240 – 320 = 340 students
Required percentage = Number of girls studying Statistics/Number students studying Chemistry
⇒ 250/340 × 100 ≈ 73.5%