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

1
25 ∶ 27
2
2 ∶ 3
3
8 ∶ 15
4
20 ∶ 27

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