The seats for Chemistry, Physics and Biology in a school are in the ratio 9 : 7 : 8. There is a proposal to increase these seats by 30%, 50% and 50% respectively. What will be the ratio of the increased seats?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 39 : 35 : 40
Increase each term of the ratio by its own percentage, that is, multiply it by its own factor, then clear the decimals.
Chemistry \(=9\times1.3=11.7\)
Physics \(=7\times1.5=10.5\)
Biology \(=8\times1.5=12\)
\(11.7:10.5:12=117:105:120\)
Dividing by 3: \(39:35:40\)
The new ratio is 39 : 35 : 40.