1.

If P : Q = 3 : 4 and Q : R = 2 : 5, then what is (P + Q) : (Q + R)?1). 1 : 22). 1 : 3 3). 2 : 34). 2 : 5

Answer»

P/Q = 3/4

⇒ P/Q + 1 = 3/4 + 1 (ADDED 1 both side)

⇒ (P + Q)/Q = 7/4 ----(i)

Q/R = 2/5

⇒ R/Q = 5/2

⇒ R/Q + 1 = 5/2 + 1

⇒ (R + Q)/Q = 7/2 ----(II)

Then equation (i) ÷ (ii)

⇒ (P + Q)/(R + Q) = (7/4)/(7/2) = 1 : 2


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