Aptitude - Ratio and Proportion - Discussion

I have one doubt related to this type of question, here they mentioned the salary amount, if salary amount is mentioned in percentage how should we calculate.

Example salary is increased 20 % each. How should we calculate.

Any one can guide me?

In this question salary is mentioned as 4000, if they just mentioned salary increased 20%, how should we calculate?

What if we consider the two variable equations for this question.

Let the salary of Ravi of be Rs x and Sumit br Rs y.

Now, acc to question... two salary's are in the ratio 2:3.

Therefore, x/y=2/3.

=> 3x = 2y...........(1).

Acc to question if we add Rs 4000 to each salary.

Therefore, x+4000/y+4000 = 40/57.

=> 57x + 22800 = 40y + 16000.

=> 57x-40y = 160000-228000.........(2).

Acc to eq1..we multiply it by 19, it becomes,

57x = 38y.......(3).

Putting the value of (3) in (2)

=> 38y-40y = -68000.

=> -2y = -68000.

=> y = 34000.

So the salary of Sumit is Rs 34000

Buddy how the salary of summit becomes 34,000 and why did you find difference pf 40 and 57?

Explain please.

This is simple.

New increment in salary led to the new ratio.

You cannot add ratio (2,3) to value (4000) hence effect the change in ratio by multiplying by x factor.

Thus, 2x+4000... etc

Let the ratio of ravi & sumith salary Rs.2x And Rs.3x.

So it's tends for 2x/3x.

Salary increased by each 4000.

2x+4000 ------(1).
3x+4000 ------(2).

Let we write,
2x+4000/3x+4000= 40/57(this is new ratio given in Q).

57(2x + 4000) = 40(3x + 4000).
6x = 68,000.
3x = 34,000.

So, Sumit current Salary =3x+ 4000.
=34,000+4000.
=38,000.

Sumit ratio is 3x.

His salary increased by 4000. So current salary is 3x+4000->equation 1.

We found out 3x=34000.

So substitute 3x=34000 in equation 1. So 34000+4000=38000.

From the beginning itself, the increased salary of both of them were added. i.e., 2x+4000/3x+4000.

My question is after finding the value of x, why they add again by 4000. Can you please clear it.

Thanks good explanation elumalai

Thanks dear good explanation by Elumalai.