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22 Dec 2023, 06:58
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x: 30
y: 10
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
45%
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Question Stats:
66% (02:05) correct
34%
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wrong
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Although large mammals like elephants and whales tend to live longer than small ones like mice, larger breeds of dogs have shorter life spans, on average, than smaller breeds. A researcher studying the relationship between average body mass and average life span in breeds of dogs concluded that, for every 2 kilograms of body mass, life span is 1 month less. According to this conclusion, the average life span of a breed with an average body mass of x kg is y months less than the average life span of a breed with an average body mass of 10 kg.
Select for x and for y values that are jointly consistent with the information provided. Make only two selections, one in each column.
Select for x and for y values that are jointly consistent with the information provided. Make only two selections, one in each column.
| x | y | |
| 10 | ||
| 15 | ||
| 20 | ||
| 25 | ||
| 30 | ||
| 35 |
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Official Answer
x: 30
y: 10
Updated on: 02 Jan 2024, 11:13
Originally posted by GMATCoachBen on 24 Dec 2023, 19:28.
Last edited by GMATCoachBen on 02 Jan 2024, 11:13, edited 1 time in total.
Last edited by GMATCoachBen on 02 Jan 2024, 11:13, edited 1 time in total.
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Video solution here (2:57):
It's very helpful to notice and quickly translate this common RATIO wording:
For every ___, there were ___ translates to a ratio!
For example, "For every 2 men, there were 3 women": (M / W) = (2 / 3)
It's very helpful to notice and quickly translate this common RATIO wording:
For every ___, there were ___ translates to a ratio!
For example, "For every 2 men, there were 3 women": (M / W) = (2 / 3)
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General Discussion
24 Dec 2023, 21:07
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loanpt0101
Although large mammals like elephants and whales tend to live longer than small ones like mice, larger breeds of dogs have shorter life spans, on average, than smaller breeds. A researcher studying the relationship between average body mass and average life span in breeds of dogs concluded that, for every 2 kilograms of body mass, life span is 1 month less. According to this conclusion, the average life span of a breed with an average body mass of x kg is y months less than the average life span of a breed with an average body mass of 10 kg.
Select for x and for y values that are jointly consistent with the information provided. Make only two selections, one in each column.
Select for x and for y values that are jointly consistent with the information provided. Make only two selections, one in each column.
Select for x and for y values that are jointly consistent with the information provided. Make only two selections, one in each column.
These type of questions are quite regular in focus edition test. The wording tells us that there are various possibilities for x and y, and just one of them is in option.
Only way to do this is by finding the relation between x and y.
x: Average life body mass
y: Difference in life span
For every increase in 2kg mass, life span decreases by 1 month.
So (Mass increase)=\(M_1-M_2=2y\)
Now mass is increasing from 10 to x, so
\(M_1-M_2=x-10=2y\)
\(x=2y+10\)
We can check options now.
x is surely even and larger than y.
so x can be 30 or 20
x=20: 20=2y+10 or y=5…..Not in options
x=30: 30=2y+10 or y=10…..Yes
Answer:
y=10
x=30
