The seats for Mathematics, English, and Chemistry in a school are in the ratio of 6 : 4 : 7. If these seats are increased by 20%, 40% and 60%, respectively, the ratio of the increased seats is:
Show answer & explanation
Correct answer: B
Explanation
The correct answer is Option 2 i.e. 9 : 7 : 14.
Let the Mathematics, English, and Chemistry seats be 600, 400, and 700.
Seats are increased by 20%, 40% and 60%.
⇒ 600 × 120/100 : 400 × 140/100 : 700 × 160/100
⇒ 600 × 120 : 400 × 140 : 700 × 160
⇒ 72000 : 56000 : 112000
⇒ 72 : 56 : 112
⇒ 9 : 7 : 14