p:q=r:s=t:u=2:3,(mp+nr+ot):(mq+ns+ou)=?

If p:q=r:s=t:u=2:3, then find (mp+nr+ot):(mq+ns+ou)

If p : q = r : s = t : u = 2 : 3, then (mp + nr + ot) : mq + ns + ou) is equal to :

If p : q = r : s , then show that : mp + nq : q = mr + ns : s .

If m is the mean of p,q,r,s,t,u,v, then what is (p-m) + (q-m) + (r-m) + (s-m) + (t-m) + (u-m) + (v-m) equal to ?