Question

Twenty years ago the ratio between the ages of sita and meena was 1 : 4 and at present it is 1 : 2. what is the age of sita at present ?

Answer 1

Let present ratio = 1x : 2x
Therefore, 1x - 20 / 2x - 20 = 1/4
4(x - 20) = 1(2x - 20)
4x - 80 = 2x - 20
4x - 2x = 80 - 20
2x = 60 
x = 60/2
x = 30 
Present ratio = 1x : 2x
30 years : 60 years
Therefore, Sita's present age = 30 years.
Check, 
20 years ago,
30 - 20 = 10 years
60 - 20 = 40 years
Ratio = 10 : 40 
1 : 4 
Hence proved

Answer 2

Answer:

1:4 is the answer. hope it helps you. thanks.