My father is currently 13 times as old as my daughter. next year, my father will be 11 times as old as my daughter. how many years old is my father now?

Suppose my daughter is x years old now, my father is 13x years old

next year my daughter will be x+1 years old, my father will be 13x+1, which is also 11 (x+1)

so 13x+1=11 (x+1)

13x+1=11x+11

2x+10

x=5

father is 13x=65 years old now.