If p,q ,and r are positive real numbers such that p(q+r) = 152, q(r+p) =162 , and r(p+q) = 170, then pqr is	Choose the correct choice from the following options:
A) a) 672
B) b) 688
C) c) 704
D) d) 720
E) e) 750
pq+pr = 152 --------------------------------------1)   qr+qp = 162---------------------------------------2)   pr+rq = 170---------------------------------------3)   Re-writing equation 3 as follows:   pr+rq = 162 + 8   pr+rq = qr+qp + 8   pr = qp + 8 ............... (4)   Adding (1)(4)   2pr = 160   pr = 80   pqr has to be multiple of 80, only 720 fits in   Answer = d) 720
<result>D</result>
If p,q ,and r are positive real numbers such that p(q+r) = 152, q(r+p) =162 , and r(p+q) = 170, then pqr is