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?
8 : 9
17 : 18
21 : 22
Cannot be determined
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:
61 comments Page 6 of 7.

Sasha said:   1 decade ago
I like ramesh's methods ! thanks a lot :).

Prasanna said:   1 decade ago
@rajeev.

Yes you get the same answers.

Muhammad Naeem said:   9 years ago
@Chaitra.

6 * 7 = 42 and 11 * 4 = 44.

Yudhisthira sarapuria said:   6 years ago
20% increase mean 120/100 = 6/5.
(4)

DEEKSHITHA said:   2 years ago
Can you say how come 42/5 :44/5?
(24)

Simran said:   1 decade ago
Can someone give short method?

Chaitra said:   9 years ago
Ramesh sir, how you get 42:44?

ABHINESH said:   1 decade ago
(7x+0.2*7x)/(8x+0.1*8x)=21:22

Poonma said:   1 decade ago
Ramesh your to good.

Waquar said:   5 years ago
Thanks @Priyabrata.
(3)


Post your comments here:

Your comments will be displayed after verification.