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Kaye and Lyn are twins, and the sum of their ages is equal to three times Dave's age, which is half as old as Keith. The average age of the four...

Kaye and Lyn are twins, and the sum of their ages is equal to three times Dave's age, which is half as old as Keith. The average age of the four children are 6.
1. Use the information to write down an equation?
2. Solve the equation and write down the age of each child?

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