How old am I now?: You are 65 years old now
Let y represent father's age now
Let x represent daughter age now
First step
y=13x
y+1=11×(x+1)
Second step
y+1=11x+11
y-11x=d
Third step
Substitute
13x-11x=10
2x=10
x=10/2
x=5
Last step
y=13x
y=13×5
y=65
Inconclusion How old am I now?: You are 65 years old now
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