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AQA A Level Biology

AQA A Level Biology

How would you work out Q8.4 please?
https://filestore.aqa.org.uk/sample-papers-and-mark-schemes/2017/june/AQA-74022-QP-JUN17.PDF

I did 1/30=0.03
1/40=0.05
Then I multiplied both by 40 to get 1.2:1 which is the wrong answer?The right answer is 1.4:1

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