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then, our ratio will be: 800 000 / 20 000, a division that can be solved mentally and matches exactly the first option. myadvice 1) in this exercise, you have a nice hint in the question's statement, when it says: 'approximately how many times…', because since then you can assume that you are allowed to use round figures. this conclusion is confirmed when you have a look at the answer options at the beginning of the exercise, as we always recommend. this way, you could have also used round values for all the operations of this exercise, just doing: for finland: 5 300 000 / 265 is approximately 5 0000 / 250 = 20 000 for germany: 82 200 000 / 101 is approximately 80 000 000 / 100 = 800 000 getting the same values that we needed to compare. 2) it is useful to keep always in mind the numerical reasoning behind our operations and results. let us say, if you made a mistake here while applying the rule of three, maybe with the nerves of your real test (that i hope we will minimise with our good lessons!), for example, by multiplying the data from the table, instead of dividing: 5 300 000 * 265 = 1 404 500 000 (or, with round figures: 5 000 000 / 250 = 1 250 000 000) you would obtain that the number of hospital beds is much higher than the whole population of finland (!!!), leading you immediately to see that your calculation is wrong. 36
最終更新： 2021-03-24
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