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# A luxury car dealership sells only Ferraris and Lamborghinis.

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A luxury car dealership sells only Ferraris and Lamborghinis.  [#permalink]

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Updated on: 03 Nov 2018, 08:50
Top Contributor
00:00

Difficulty:

15% (low)

Question Stats:

83% (00:30) correct 18% (01:15) wrong based on 40 sessions

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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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Originally posted by Baten80 on 01 Nov 2018, 14:52.
Last edited by Baten80 on 03 Nov 2018, 08:50, edited 1 time in total.
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Re: A luxury car dealership sells only Ferraris and Lamborghinis.  [#permalink]

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03 Nov 2018, 02:24
1
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.

Hope it is clear.
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Re: A luxury car dealership sells only Ferraris and Lamborghinis.  [#permalink]

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04 Nov 2018, 17:00
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.

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Re: A luxury car dealership sells only Ferraris and Lamborghinis. &nbs [#permalink] 04 Nov 2018, 17:00
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