Aptitude - Ratio and Proportion - Discussion
Discussion Forum : Ratio and Proportion - General Questions (Q.No. 6)
6.
The ratio of the number of boys and girls in a college is 7 : 8. If the percentage increase in the number of boys and girls be 20% and 10% respectively, what will be the new ratio?
Answer: Option
Explanation:
Originally, let the number of boys and girls in the college be 7x and 8x respectively.
Their increased number is (120% of 7x) and (110% of 8x).
 |
 |
120 | x 7x |  |
and | |
110 | x 8x | |
| 100 | 100 |
| |
42x | and | 44x |
| 5 | 5 |
 The required ratio = |
|
42x | : | 44x | |
= 21 : 22. |
| 5 | 5 |
Discussion:
64 comments Page 6 of 7.
Pankaj said:
1 decade ago
There is some problem to understand the problem ie question is asked 20% and 10% but here get 120% and 110% why ?
Sunali said:
1 decade ago
Thanks priyabhrt.
Prasanna said:
1 decade ago
@rajeev.
Yes you get the same answers.
Yes you get the same answers.
Rajeev said:
1 decade ago
@ ramesh
Can you tell you multiply 70 & 80 instead of 7 & 8, as we get same answer in both the cases?
Can you tell you multiply 70 & 80 instead of 7 & 8, as we get same answer in both the cases?
Kavya said:
1 decade ago
I am getting 7:4 by whichever method I do. I am not satisfied with any explanations given. Help me.
Priyabrata said:
1 decade ago
20% of 7=14/10,total increase 7+14/10=84/10
10% of 8=8/10,total increase 8+8/10=88/10
now compare ratio of Boys and Girls
84/10:88/10
or 84:88
or 42:44
or 21:22
10% of 8=8/10,total increase 8+8/10=88/10
now compare ratio of Boys and Girls
84/10:88/10
or 84:88
or 42:44
or 21:22
RAJ said:
1 decade ago
RAMESH very well said. ! keep posting your SHORTCUT method. Its very useful for us. !i search at every discussion. Because of you. !
Khushboo said:
1 decade ago
Why do we multiply 120% by 7x and 100% by 8x
Why not we simply multiply 20% by 7x and 10% by 8x ?
Please someone explain me.
Why not we simply multiply 20% by 7x and 10% by 8x ?
Please someone explain me.
Poonma said:
1 decade ago
Ramesh your to good.
Sasha said:
1 decade ago
I like ramesh's methods ! thanks a lot :).
Post your comments here:
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers