If the ratio P ∶ Q = 2 ∶ 3, and Q ∶ R = 3 ∶ 4 then the ratio P + Q ∶ Q + R is:

1
5 ∶ 7
2
7 ∶ 5
3
7 ∶ 9
4
9 ∶ 7

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