2017 · Q89
The following bar chart shows the number of boys and girls studying four subjects. Mathematics: 150 boys, 90 girls; Physics: 180 boys, 120 girls; Statistics: 70 boys, 250 girls; Chemistry: 136 boys, 204 girls. What is the difference between the number of boys studying Mathematics and the number of girls studying Physics ?
Elementary MathematicsStatistics
- A20
- B30
- C60
- D80
Explanation
This is a bar-chart reading exercise with a deliberate gender/subject swap. Boys studying Mathematics = 150 and girls studying Physics = 120 — two different columns from two different subjects. Their difference is 150 − 120 = 30. The trap is pairing boys with boys or subjects with themselves, e.g. 180 − 120 = 60. Hence option (B) 30.