Father and daughter

Father is 36 years old, daughter is 20 years less. What will be the ratio between them when they are 10 years more?

Result

x =  23:13

Solution:

$f=36 \ \\ d=f-20=36-20=16 \ \\ \ \\ x=\dfrac{ f+10 }{ d+10 }=\dfrac{ 36+10 }{ 16+10 } \doteq \dfrac{ 23 }{ 13 } \doteq 1.7692≈ 1.7692 \doteq 23:13$

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