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

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If f footballs cost d dollars, then in terms of d and f how [#permalink]  16 Sep 2018, 07:33
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Question Stats:

100% (00:25) correct 0% (00:00) wrong based on 3 sessions
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. $$f\frac{d}{10}$$
[Reveal] Spoiler: OA

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Re: If f footballs cost d dollars, then in terms of d and f how [#permalink]  16 Sep 2018, 08:38
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Expert's post
Carcass 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 info, 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?

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   [#permalink] 16 Sep 2018, 08:38
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