Difference between revisions of "2020 AMC 8 Problems/Problem 15"
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+ | ==Solution 5== | ||
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+ | We know that <math>0.15x=0.20y</math>. Therefore, we can just assume that <math>x=20</math> and <math>y=15</math>, which means that <math>\frac{y}{x}=\frac{15}{20}=\frac{75}{100}</math>, so our answer is <math>\boxed{\textbf{(C) }75}</math>. | ||
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+ | - StarryNight7210 | ||
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==See also== | ==See also== | ||
{{AMC8 box|year=2020|num-b=14|num-a=16}} | {{AMC8 box|year=2020|num-b=14|num-a=16}} | ||
{{MAA Notice}} | {{MAA Notice}} |
Revision as of 20:01, 18 November 2020
Suppose of equals of What percentage of is
Solution 1
Multiply by to get . The here can be converted to . Therefore, is the answer.
Solution 2
Letting , our equation becomes . Clearly, is of and the answer is .
~junaidmansuri
Solution 3
Let us transform the first sentence to an equation. and So, Therefore, and hence .
--Aops-g5-gethsemanea2
Solution 4
We are given that . Multiplying both sides by and dividing by tells us that .
-franzliszt
Solution 5
We know that . Therefore, we can just assume that and , which means that , so our answer is .
- StarryNight7210
See also
2020 AMC 8 (Problems • Answer Key • Resources) | ||
Preceded by Problem 14 |
Followed by Problem 16 | |
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 AJHSME/AMC 8 Problems and Solutions |
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