Dave is d years old. Sonya is three times Dave's age. Which expression represents the sum of their ages in terms of d?

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Multiple Choice

Dave is d years old. Sonya is three times Dave's age. Which expression represents the sum of their ages in terms of d?

Explanation:
The total ages are found by adding Dave’s age to Sonya’s. If Dave is d years old, Sonya, being three times as old, is 3d. So the sum is d + 3d = 4d. The expression that represents their combined ages in terms of d is 4d.

The total ages are found by adding Dave’s age to Sonya’s. If Dave is d years old, Sonya, being three times as old, is 3d. So the sum is d + 3d = 4d. The expression that represents their combined ages in terms of d is 4d.

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