Nina is 10 years younger than Deepak. Deepak is 3 times as old as Nina. Which system of equations can be used to find d, Deepak's age, and n, Nina's age?

A) d = n + 10 d = 3n

B) d = n - 10 d = 3n

C) d = n + 10 n = 3d

D) d = n - 10 n = 3d

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