Difference between revisions of "2020 AMC 8 Problems/Problem 15"
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==Solution 1== | ==Solution 1== | ||
Multiply by <math>5</math> to get <math>0.75x=y</math>. The <math>0.75</math> here can be converted to <math>75\%</math>. Therefore, <math>\boxed{\textbf{C}}</math> is the answer. | Multiply by <math>5</math> to get <math>0.75x=y</math>. The <math>0.75</math> here can be converted to <math>75\%</math>. Therefore, <math>\boxed{\textbf{C}}</math> is the answer. | ||
| + | |||
| + | ==Solution 2== | ||
| + | Letting <math>x=100</math>, our equation becomes <math>0.15\cdot 100 = 0.2\cdot y \implies 15 = \frac{y}{5} \implies y=75</math>. Clearly, <math>y</math> is <math>75%</math> of <math>x</math> and the answer is <math>\boxed{\textbf{C}}</math>.<br> | ||
| + | ~jmansuri | ||
==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 03:32, 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 $75%$ (Error compiling LaTeX. Unknown error_msg) of and the answer is .
~jmansuri
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 | ||
The problems on this page are copyrighted by the Mathematical Association of America's American Mathematics Competitions. 
