Aptitude - Ratio and Proportion - Discussion
Discussion Forum : Ratio and Proportion - General Questions (Q.No. 4)
4.
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?
Answer: Option
Explanation:
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.
Discussion:
88 comments Page 5 of 9.
Dipendra said:
6 years ago
Only increased seats?
How is it possible? Please tell me.
How is it possible? Please tell me.
Subho said:
6 years ago
Math seats 5 increased will be 4% = now number of total seats 7. Physics seats 7 increased will be 50% = now number of total seats = 10.5. Bio seats 8 increased will be 75%= now the total number of state 14.
So, new seats ratio are 7:10.5:14.
= 2:3:4.
So, new seats ratio are 7:10.5:14.
= 2:3:4.
Himanshu said:
6 years ago
5:7:8 means 5/20 which means 0.25.
2:3:4 means 2/9 which means 0.22.
But it is saying that the seats have increased. But according to maths the seats have decreased.
Can anyone please tell me how is this possible?
2:3:4 means 2/9 which means 0.22.
But it is saying that the seats have increased. But according to maths the seats have decreased.
Can anyone please tell me how is this possible?
Priya said:
6 years ago
Nice explanation Mr. Harjinder Singh. Way to think in a simple manner.
Udit said:
5 years ago
How 7x:21/2x:14x =14x:21x:28x?
Anyone, please explain to me.
Anyone, please explain to me.
Shravya said:
1 month ago
How it comes? Please explain to me.
Anu said:
5 days ago
@Thrishika.
Because we suppose 100% for the 1 part value.
Because we suppose 100% for the 1 part value.
Emani karthik Reddy said:
1 decade ago
Thanks singh for easy to solve the problems.Keep it up.
Bala said:
1 decade ago
Why we should add 100+x?
Nikhil said:
1 decade ago
@Harjinder can you please tell me how do we find out?
1. 40% of 5 = 2, total seats 5+2 = 7.
2. 50% of 7 = 7/2 total seats 7+7/2 = 21/2.
3. 75% of 8 = 6 total seats 8+6 = 14.
1. 40% of 5 = 2, total seats 5+2 = 7.
2. 50% of 7 = 7/2 total seats 7+7/2 = 21/2.
3. 75% of 8 = 6 total seats 8+6 = 14.
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