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Explanation

The average age of a couple = 26 years.

Total age of couples = 26 x 2 = 52 years

$\inline \fn_cm \therefore$ Total age of couple after 11 years = (52 + 2 * 11 ) = 74 years

Suppose average age of 3 children after 11 years is 3x years.

$\inline \fn_cm \Rightarrow \frac{74+3x}{5}=19 \Rightarrow x=7$

The average age of children is 7 years

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