Difference between revisions of "2013 AMC 12A Problems/Problem 6"
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<math>\frac{3}{10}*30*2</math>,which is <math>B</math>. | <math>\frac{3}{10}*30*2</math>,which is <math>B</math>. | ||
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| + | ==Additional note== | ||
| + | |||
| + | It is also reasonably easy to find all possibilities for the number of two-point and three-point shots she made. Just note that both numbers of successful throws have to be integers. For "<math>30\%</math> of her two-point shots" to be an integer we need the number of two-point shots to be divisible by 10. This only leaves four possibilities for the number of two-point shots: 0, 10, 20, or 30. Each of them also works for the three-point shots, and as shown above, for each of them the total number of points scored is the same. | ||
== See also == | == See also == | ||
{{AMC12 box|year=2013|ab=A|num-b=5|num-a=7}} | {{AMC12 box|year=2013|ab=A|num-b=5|num-a=7}} | ||
{{MAA Notice}} | {{MAA Notice}} | ||
Revision as of 17:11, 22 November 2013
Problem
In a recent basketball game, Shenille attempted only three-point shots and two-point shots. She was successful on 
of her three-point shots and 
of her two-point shots. Shenille attempted 
shots. How many points did she score?
Solution
Let the number of 3-point shots attempted be 
. Since she attempted 30 shots, the number of 2-point shots attempted must be 
.
Since she was successful on , or 
, of her 3-pointers, and , or 
, of her 2-pointers, then her score must be
, which is 
Alternative Solution
Since the problem doesn't specify the number of 3-point shots she attempted, it can be assumed that number doesn't matter, so let it be 
. Then, she must have made 2-point shots. So, her score must be:
,which is .
Additional note
It is also reasonably easy to find all possibilities for the number of two-point and three-point shots she made. Just note that both numbers of successful throws have to be integers. For " of her two-point shots" to be an integer we need the number of two-point shots to be divisible by 10. This only leaves four possibilities for the number of two-point shots: 0, 10, 20, or 30. Each of them also works for the three-point shots, and as shown above, for each of them the total number of points scored is the same.
See also
| 2013 AMC 12A (Problems • Answer Key • Resources) | |
| Preceded by Problem 5 |
Followed by Problem 7 |
| 1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 • 16 • 17 • 18 • 19 • 20 • 21 • 22 • 23 • 24 • 25 | |
| All AMC 12 Problems and Solutions | |
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