Aptitude - Ratio and Proportion - Discussion

Discussion Forum : Ratio and Proportion - General Questions (Q.No. 12)
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?
2 : 5
3 : 7
5 : 3
7 : 3
Answer: Option
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.

Discussion:
23 comments Page 3 of 3.

Kusu said:   1 decade ago
Why
2A/5=2B/3

A/B=2/3x5/2=5/3


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

Aparna said:   1 decade ago
hey,read the question carefully
it is said 40% of a number
not increases by 40%
and the meaning 'of' is '*'

Raghu said:   1 decade ago
why are we not taking as 140 (40+100)in this case??


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