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Expert replies
by akhilsuhag » Thu Jan 01, 2015 1:15 am
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Hi Could experts please help with this one. Thanks.
Please press "thanks" if you think my post has helped you.. Cheers!!
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Source: — Critical Reasoning |

by [email protected] » Thu Jan 01, 2015 9:19 pm
Hi akhilsuhag,

This CR prompt is an Inference question; we have to use the information in the prompt to logically infer one of the 5 answer choices. Answers to inference questions can be based on a few words, 1 or more sentences or the entire prompt. It can sometimes be difficult to predict the correct answer to an inference question though.

The Facts:
From 1980 to 1989
-Total consumption of fish rose 4.5%
-Total consumption of poultry rose 9%
-Total population rose by 6%, in part to immigration

The Logic:
Unfortunately, we don't have any numbers to work with, so we don't know how much actual fish or poultry was consumed and we don't know the actual population. Since we're given percentage data to work with, the correct answer will likely involve those percentages though.

We now have to work through the answers and eliminate the 4 that don't have anything to do with the given Facts:

A: This mentions profits, but we have no information on that.
B: The likely diets of the people who immigrated to the country is also something we have no information on. Maybe the people who immigrated ate more poultry, but maybe they actually ate more fish and the locals ate more poultry.
C: This is a distortion - we don't know how much fish or poultry was consumed, so we can't say that twice as much poultry was consumed as fish.
D: We don't know what percent of the population ate fish and poultry regularly, so we can't say that it was necessarily a significant portion of the population.
E: The per capita consumption of fish was lower in 1989 than in 1980. This we CAN infer because the population grew at a faster rate than the consumption of fish. It doesn't matter what the starting and ending numbers are, as long as those percentage increases take place, the RELATIONSHIP between the numbers in 1980 and in 1989 will show a decrease in per capita consumption of fish.

Final Answer: E

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by GMATGuruNY » Thu Jan 01, 2015 11:17 pm
From 1980 to 1989, total consumption of fish in the country of Jurania increased by 4.5 percent, and total consumption of poultry products there increased by 9.0 percent. During the same period, the population of Jurania increased by 6 percent, in part due to immigration to Jurania from other countries in the region.

If the statements above are true, which of the following must also be true on the basis of them?

A. During the 1980's in Jurania, profits of wholesale distributors of poultry products increased at a greater rate than did profits of wholesale distributors of fish.
B. For people who immigrated to Jurania during the 1980's, fish was less likely to be a major part of their diet than was poultry.
C. In 1989 Juranians consumed twice as much poultry as fish.
D. For a significant proportion of Jurania's population, both fish and poultry products were a regular part of their diet during the 1980's.
E. Per capita consumption of fish in Jurania was lower in 1989 than in 1980.
The correct answer choice is WHAT MUST BE TRUE.

Answer choice E: Per capita consumption of fish in Jurania was lower in 1989 than in 1980.
Let f = total fish consumption in 1980 and t = total population in 1980.
Per capita consumption of fish means the average amount of fish consumed by each person.
In 1980, per capita consumption of fish = f/t.
In 1989, the total fish consumption increases by 4.5% and the total population increases by 6%.
Per capita consumption of fish in 1989 = (1.045f)/(1.06t).
(1.045/1.06)(f/t) < f/t.
1989 < 1980.
Thus, answer choice E is WHAT MUST BE TRUE.

The correct answer is E.
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