In a certain population, the two most heavily diagnosed diseases are schistosomiasis and malaria. Over the past five years, malaria has accounted for more than half of all disease cases, and schistosomiasis, which accounted for 40% of all disease cases in the community five years ago, accounted for 30% in the past year.
Which of the following must be true on the basis of the statements above?
A) There were fewer cases of schistosomiasis last year than five years ago.Wrong.
The fact that the percentage is less than that in the past does not mean the absolute value is also less. ==> Eliminate right away.
B) The percentage of disease cases from malaria has increased over the past 5 years.Wrong.
No information of percentage of disease cases from malaria in the past ==> Eliminate right away.
C) Some disease has experienced an increase in the number of its total cases, as long as the total number of disease cases went down by a number less than 30%.Wrong.
Quite confused. However, it's wrong because of "some disease" is not clear. In this question, we just talk about Malaria and schistosomiasis.
D) Each year over the past five, malaria has accounted for a larger percentage of disease cases than schistosomiasis.Wrong.
Shell game. But it's wrong because it says "Each year".
E) If the total number of schistosomiasis cases increased over the past five years, then the total number of disease cases must have increased by more than 30%.Correct.
five years ago, the number of schistosomiasis cases was 40/100 total number of disease cases (40%). Last year, the number of schistosomiasis was 60 ==> Total number of disease cases was (60 /30%)x100% = 200 ==> Total disease cases increased 100% that is more than 30%.
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