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Ratio and Proportion

Q1: Seats for Mathematics, Physics and Biology in a school are in the ratio 5 : 7 : 8. There is a proposal to increase these seats by 40%, 50% and 75% respectively. What will be the ratio of increased seats?

A 2 : 3 : 4

B 6 : 7 : 8

C 6 : 8 : 9

D None of these

ANS:A - 2 : 3 : 4

Originally, let the number of seats for Mathematics, Physics and Biology be 5x, 7x and 8x respectively. Number of increased seats are (140% of 5x), (150% of 7x) and (175% of 8x).

140 x 5x , 150 x 7x and 175 x 8x
100 100 100
7x, 21x and 14x.
2
The required ratio = 7x : 21x : 14x
2
14x : 21x : 28x 2 : 3 : 4.



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