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Debbie is two years older than chuck. The sum of their ages is 30. Find each of their ages.
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Solution 1. Two equations
D - C = 2,
D + C = 30.
Add the two equations.
Solution 2. One equation.
Let D be the Debbie age. Then the Chuk age is D-2.
We are given that
D + (D-2) = 30.
Simplify and solve.