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If f footballs cost d dollars, then in terms of d and f how many dolla

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Joined: 02 Sep 2009
Posts: 55638
If f footballs cost d dollars, then in terms of d and f how many dolla  [#permalink]

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New post 17 Sep 2018, 01:48
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A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

87% (00:38) correct 13% (00:24) wrong based on 35 sessions

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VP
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Joined: 31 Oct 2013
Posts: 1371
Concentration: Accounting, Finance
GPA: 3.68
WE: Analyst (Accounting)
Re: If f footballs cost d dollars, then in terms of d and f how many dolla  [#permalink]

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New post 17 Sep 2018, 03:38
Bunuel wrote:
If f footballs cost d dollars, then in terms of d and f how many dollars would 10 footballs cost?


A. \(10 f d\)

B. \(f\frac{d}{10}\)

C. \(10\frac{d}{f}\)

D. \(d\frac{f}{10}\)

E. \(f\frac{d}{10}\)



f footballs cost d dollars

1 football costs d/f dollars

10 footballs cost 10d/f dollars.

The best answer is C.
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Re: If f footballs cost d dollars, then in terms of d and f how many dolla  [#permalink]

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New post 17 Sep 2018, 07:22
Top Contributor
Bunuel wrote:
If f footballs cost d dollars, then in terms of d and f how many dollars would 10 footballs cost?


A. \(10 f d\)

B. \(f\frac{d}{10}\)

C. \(10\frac{d}{f}\)

D. \(d\frac{f}{10}\)

E. \(f\frac{d}{10}\)


If f footballs cost d dollars...
With this information, how much does ONE football cost?
If you're not sure, try testing some values.
For example, if 3 footballs cost 15 dollars, then ONE football costs 5 dollars (aka 15/3 dollars)
If 7 footballs cost 28 dollars, then ONE football costs 4 dollars (aka 28/7 dollars)
If 10 footballs cost 80 dollars, then ONE football costs 8 dollars (aka 80/8 dollars)
See the pattern?

So, if f footballs cost d dollars, then ONE football costs d/f dollars

If ONE football costs d/f dollars, then TWO football costs (2)(d/f) dollars
If ONE football costs d/f dollars, then THREE football costs (3)(d/f) dollars
.
.
.

If ONE football costs d/f dollars, then TEN football costs (10)(d/f) dollars

Answer: C

Cheers,
Brent
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Re: If f footballs cost d dollars, then in terms of d and f how many dolla   [#permalink] 17 Sep 2018, 07:22
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