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

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Math Expert
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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17 Sep 2018, 01:48
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Difficulty:

25% (medium)

Question Stats:

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

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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. $$f\frac{d}{10}$$

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Joined: 31 Oct 2013
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Concentration: Accounting, Finance
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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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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.

CEO
Joined: 12 Sep 2015
Posts: 3782
Re: If f footballs cost d dollars, then in terms of d and f how many dolla  [#permalink]

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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

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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