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A luxury car dealership sells only Ferraris and Lamborghinis.

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MHIKER
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A luxury car dealership sells only Ferraris and Lamborghinis. [#permalink] New post   Updated on: 03 Nov 2018, 09:50
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A luxury car dealership sells only Ferraris and Lamborghinis. If the number of Ferraris for sale is 4/9 of the total number of cars for sale, then for every 4 Ferraris there are:
A. 2 Lamborghinis
B. 3 Lamborghinis
C. 4 Lamborghinis
D. 5 Lamborghinis
E. 9 Lamborghinis
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D

Originally posted by MHIKER on 01 Nov 2018, 15:52.
Last edited by MHIKER on 03 Nov 2018, 09:50, edited 1 time in total.
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Re: A luxury car dealership sells only Ferraris and Lamborghinis. [#permalink] New post   03 Nov 2018, 03:24
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You mean \(\frac{4}{9}\)

In this case, if the number of cars is \(x\), the number of ferraris is \(\frac{4}{9}*x\)

If the number of ferraris is 4 then \(\frac{4}{9}*x=4\) means that \(x=9\)

So 9 cars in total, so 5 lambos.

Answer D

Hope it is clear.
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Re: A luxury car dealership sells only Ferraris and Lamborghinis. [#permalink] New post   04 Nov 2018, 18:00
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Baten80 wrote:
A luxury car dealership sells only Ferraris and Lamborghinis. If the number of Ferraris for sale is 4/9 of the total number of cars for sale, then for every 4 Ferraris there are:
A. 2 Lamborghinis
B. 3 Lamborghinis
C. 4 Lamborghinis
D. 5 Lamborghinis
E. 9 Lamborghinis


We can create the equation:

F/(F + L) = 4/9

9F = 4F + 4L

5F = 4L

Alternate Solution:

Since the fraction of Ferraris for sale is 4/9 of the total, then the fraction of Lamborghinis for sale is 5/9 of the total. If we were to assume that there were 9 cars for sale, we would see that there were 4
Ferraris and 5 Lamborghinis, with a resulting ratio of 4 to 5.

Answer: D
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BrentGMATPrepNow
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Re: A luxury car dealership sells only Ferraris and Lamborghinis. [#permalink] New post   21 Nov 2019, 08:17
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Baten80 wrote:
A luxury car dealership sells only Ferraris and Lamborghinis. If the number of Ferraris for sale is 4/9 of the total number of cars for sale, then for every 4 Ferraris there are:
A. 2 Lamborghinis
B. 3 Lamborghinis
C. 4 Lamborghinis
D. 5 Lamborghinis
E. 9 Lamborghinis



The number of Ferraris for sale is 4/9 of the TOTAL number of cars for sale
In other words, out of every 9 cars sold 4 of them are Ferraris.
In other words, out of every 9 cars sold 5 of them are NOT Ferraris.
In other words, for every 4 Ferrari sold, 5 NON Ferraris are sold
Since the dealership sells only Ferraris and Lamborghinis, we know that 5 Lamborghinis are sold

Answer: D

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Brent
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Re: A luxury car dealership sells only Ferraris and Lamborghinis. [#permalink]
21 Nov 2019, 08:17
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