If `p : q=2:3` and `q : r = 4,:5` , then find `p : q : r.`

If P : Q = 2 : 3 and P : R = 4 : 5, then what is (P + Q) : (Q + R)?

If P: Q =8.15 and Q:R =3:2 , then find P:Q:R

If p:q=3:2 and q:r=6:5 then p:q:r is equal to

If (p)/( q - r) = (p + q)/( r) = (q)/( p) , Then find q : p : r

If p:q=3:4 and q:r=8:9 then p:r is

If p = -2, q = - 1 and r = 3, find the value of (i) p^(2) + q^(2) - r^(2) (ii) 2p^(2) - q^(2) + 3r^(2) (iii) p - q - r (iv) p^(3) + q^(3) + r^(3) + 3 pqr (v) 3p^(2) q + 5pq^(2) + 2 pqr (vi) p^(4) + q^(4) - r^(4)