Aptitude - Ratio and Proportion - Discussion

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"We cannot solve our problems with the same thinking we used when we created them."

- Albert Einstein

12.

If 40% of a number is equal to two-third of another number, what is the ratio of first number to the second number?

[A].	2 : 5	[B].	3 : 7
[C].	5 : 3	[D].	7 : 3

Answer: Option A

Explanation:

Let 40% of A = 2 B

3

Then, 40A = 2B

100 3

2A = 2B

5 3

A = 2 x 5 = 5

B 3 2 3

A : B = 5 : 3.

Raghu said: (Thu, Dec 9, 2010 05:22:06 AM)

why are we not taking as 140 (40+100)in this case??

Aparna said: (Sun, Dec 26, 2010 03:44:50 PM)

hey,read the question carefully it is said 40% of a number not increases by 40% and the meaning 'of' is '*'

Kusu said: (Tue, Nov 15, 2011 03:24:08 PM)

Why 2A/5=2B/3 A/B=2/3x5/2=5/3 Why not 2a/5=2b/3 then 2a3=52b 6a=10b =>A:B=3:5