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yikes000
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Although large mammals like elephants and whales tend to live longer Updated on: 06 Jan 2024, 10:52
Originally posted by yikes000 on 06 Jan 2024, 05:38.
Last edited by Sajjad1994 on 06 Jan 2024, 10:52, edited 1 time in total.
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x: 30 y: 10
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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.

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KLSVGMAT
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Although large mammals like elephants and whales tend to live longer 11 Jan 2024, 14:00
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For every extra 2 kg, the life span decreases by 1. Let's say one breed's weight is 13 kg and the other one's is 9 kg. The difference is 4 kg, so the life span will decrease by 2 months. If the difference is 6 kg, the life span decrease is 3 months and so on...

Now, the weight is x kg and the other one is 10 kg. The difference is (x-10) kg. And y = (x-10)/2. So, x is an even number - 20 or 30. The only right answer here x=30 and y= (30-10)/2 = 10.
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yikes000
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Although large mammals like elephants and whales tend to live longer 07 Jan 2024, 01:50
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Hey Sajjad1994 can you post the explanation? thanks!
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Although large mammals like elephants and whales tend to live longer 11 Jan 2024, 04:50
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Yeah this would need an explanation.
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Although large mammals like elephants and whales tend to live longer 11 Jan 2024, 19:56
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yikes000
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.

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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
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Although large mammals like elephants and whales tend to live longer 13 Jun 2024, 21:54
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For every 2 kgs , life span is 1 month less.

Hence , for every extra 10 kgs , life span 10/2 = 5 months less.

But see , y is not 5 in any of the options.

Hence , x=10 + 10 = 20 can be ruled out.

Try with x= 30 , In that case the extra will be = 30 -10 = 20 kgs ( Since we are comparing with a 10 kg breed)

Hence , for every extra 20 kgs , life span will be 20/2 = 10 months less.

y=10 ; x= 30

Note you cant try with x=15 or 25 as they are not even divisible by 2 and no option in y is given in decimals.
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Although large mammals like elephants and whales tend to live longer 30 Jan 2025, 03:52
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is there any trick to solve these kind of ques like at first glance my mind stop working after seeing the question how can i solve this but after seeing ur it felt lott easier
sayan640
For every 2 kgs , life span is 1 month less.

Hence , for every extra 10 kgs , life span 10/2 = 5 months less.

But see , y is not 5 in any of the options.

Hence , x=10 + 10 = 20 can be ruled out.

Try with x= 30 , In that case the extra will be = 30 -10 = 20 kgs ( Since we are comparing with a 10 kg breed)

Hence , for every extra 20 kgs , life span will be 20/2 = 10 months less.

y=10 ; x= 30

Note you cant try with x=15 or 25 as they are not even divisible by 2 and no option in y is given in decimals.
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Although large mammals like elephants and whales tend to live longer 14 Feb 2025, 11:13
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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.

Find the relationship between \(x\) and \(y\)

From the passage:

for every 2 kilograms of body mass, life span is 1 month less

So, with regard to specifics of the question, for every 2 kilograms of body mass over 10 kilograms, the lifespan will be 1 month less than the lifespan of a breed with a body mass of 10 kilograms.

Thus, the relationship between \(x\) and \(y\) is the following:

\(\frac{x - 10}{2} = y\)

Find two values in the list that fit the relationship

10

15

20

25

30

35

Since \(\frac{x - 10}{2} = y\), \(x = 2y + 10\).

The smallest possible \(y\) is \(10\). So, the smallest possible \(x\) is \(2(10) + 10 = 30\).

\(\frac{30 - 10}{2} = 10\)

We see that \(x = 30\) and \(y = 10\) fit the relationship.

Correct answer: 30, 10
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