Family age

Kubo is 14 years old and has a one-year-old sister Nina and four-year-old brother Sam. How many years will Nina and Sam be as old as Kubo?

Correct answer:

x =  9

Step-by-step explanation:

$$\begin{gathered} (1+x)+(4+x)=14+x \\ x=9 \end{gathered}$$

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