Xiaoming is 10 years old. The sum of his mother's and father's age is 71 years old. How many years later, their average age is 35 years old

Xiaoming is 10 years old. The sum of his mother's and father's age is 71 years old. How many years later, their average age is 35 years old

（35x3-10-71）÷3
=24÷3
=8 years
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