• # question_answer 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. The ratio of increased seats will be A)  2 : 3 : 4B)         6 : 8 : 9C)  6 : 7 : 8           D)  None of these.

Correct Answer: A

Solution :

[a] Let the number of seats for mathematics, physics and biology be 5x, 7x and 8x respectively. No of increased seats are (140% of 5x), (150% of 7x) and (175% of 8x) i.e.        $\left( \frac{140}{100}\times 5x \right),\,\,\,\left( \frac{150}{100}\times 7x \right)$ and $\left( \frac{175}{100}\times 8x \right)$ i.e.        $7x,\frac{21}{2},14x$ $\therefore$ Required ratio $7x:\frac{21}{2}x:14x$ i.e. $14x:21x:28x$ = 2 : 3 : 4

You need to login to perform this action.
You will be redirected in 3 sec