How many children are there?

Algebra Level 2

The sum of the children's ages is one-half the sum of the parent's ages. Two years ago, the sum of the parent's ages is \(28\) less than thrice the sum of the children's ages. Twenty years from now, the sum of the children's ages is \(20\) more than the sum of the parent's ages. How many children are there?

Clarification: parents is compose of a mother and a father

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