Question

To complete a job father requires 9 days less than his son together they can complete the job in 20days if so find the number of days required by each one to complete the job​

Answer 1

Let father be y
And son be x

y = x - 9 this is first eqn

if both work

x + y = 20

Solving simultaneously

x = 14.5
Y = 5.5

So father takes 5.5 days
Son takes 14.5 days