Quantitative Aptitude Ratio and Proportion Simple Ratios

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: 

1
9 ∶ 7 ∶ 8
2
9 ∶ 7 ∶ 14
3
1 ∶ 2 ∶ 3
4
7 ∶ 9 ∶ 14

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