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 7 of 9.
Mariah said:
1 decade ago
Can we apply this shortcut for other problems?
Sandi said:
1 decade ago
Very good shortcut ramesh.
Vivek mishra said:
1 decade ago
Thanks to giving a good salution with shortcut.
Hari said:
1 decade ago
Good shortcut ramesh.
Ramesh said:
1 decade ago
5:7:8 = 50:70:80
50*140/100=70 ; 70*150/100=105 ; 80*175/100=140
70: 105: 140 or
14: 21: 28 or
2: 3: 4
50*140/100=70 ; 70*150/100=105 ; 80*175/100=140
70: 105: 140 or
14: 21: 28 or
2: 3: 4
Richa said:
1 decade ago
@ shwetha
when it is said that there is x% or y% increase in any value then to find out that increased value we have do
100+x
as in this example a value increased 40% means 100+40=140
when it is said that there is x% or y% increase in any value then to find out that increased value we have do
100+x
as in this example a value increased 40% means 100+40=140
Praveen said:
1 decade ago
Any shortcut for this ?
Malli said:
1 decade ago
Because initial amount is 100 then 100+40=140 etc.
Rubesh said:
9 years ago
40% of 5 = 140/100 * 5 = 7.
50% of 7 = 150/100 * 7 = 21/2.
75% of 8 = 175/100 * 8 = 14.
Now take common 7.
7(14 : 21 : 28) = 2 : 3 : 4.
50% of 7 = 150/100 * 7 = 21/2.
75% of 8 = 175/100 * 8 = 14.
Now take common 7.
7(14 : 21 : 28) = 2 : 3 : 4.
Priya said:
8 years ago
Sikander can you explain in what aspect you are taking?
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