Amy wrote \(320\) pages (rounded to nearest tens) in \(20\) days (rounded to nearest tens). On average, the number of pages \(x\) that Amy wrote per day must have been between

A. \(\dfrac{315}{25}\le x \le \dfrac{325}{15}\)

B. \(\dfrac{315}{15} < x < \dfrac{325}{25}\)

C. \(\dfrac{315}{24}\le x \le \dfrac{324}{15}\)

D. \(\dfrac{320}{25} < x < \dfrac{320}{15}\)

E. \(\dfrac{315}{20} < x < \dfrac{325}{20}\)

Answer: C

Source: e-GMAT