What is the value of \(\dfrac{r}2 + \dfrac{s}2 ?\)

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What is the value of \(\dfrac{r}2 + \dfrac{s}2 ?\)

(1) \(\dfrac{r + s}2 = 5\)
(2) \(r + s= 10\)

Answer: D

Source: GMAT Paper Tests