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

Nina is 10 years younger than Deepak. Deepak is 3 times as old an Nina. Which system-example-1
User Lasf
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The answer would be the first choice which is d = n + 10, d = 3n. Deepak is 10 years older than Nina, so knowing this, the equation cancels out B and D. And Deepak is 3 times Nina's age, not Nina's age is three times Deepak's. It is not the other way around. 
User Ohad Zadok
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