Question

the age of Rahul and Ravi are in the ratio 5:7. four years later the sum of their age will be 56 years what is the present age of Ravi in years

Answer 1

Let the ages in the form be x.
Then present age be 5x and 7x.
After 4 years,
age of Rahul =5x+4
age of Ravi=7x+4
A/q
5x+4+7x+4=56
12x+8=56
12x=56-8=48
x=4
Age of Rahul=5×4=20
Age of Ravi=7×4=28

Answer 2

$(5x + 4) + (7x + 4) = 56$
12x + 8 = 56
4(3x+2)=56
3x + 2 = 14
3x=12
x=4