The number of buckets on the periphery of a Pelton wheel is given by
A
$$\frac{{\text{D}}}{{2{\text{d}}}} + 5$$
B
$$\frac{{\text{D}}}{{2{\text{d}}}} + 10$$
C
$$\frac{{\text{D}}}{{2{\text{d}}}} + 15$$
D
$$\frac{{\text{D}}}{{2{\text{d}}}} + 20$$
Correct Answer: $$\frac{{\text{D}}}{{2{\text{d}}}} + 15$$